#30. Jon Favreau
Jon Favreau is introduced in Season 3 as Pete Becker, a millionaire computer mogul who seduces Monica while she’s working at the Moondance Diner. She rejects him at first but after learning via Chandler who he is, she reconsiders.
Even though they face a few bumps on the road at first, they end up enjoying a few tender moments. However, their relationship soon dissipates after Pete announces his new ambition —to become a UFC fighter, despite his lack of skills.
#29. Debi Mazar
In “The One Where Rachel Has a Baby: Part 1,” Ross and Rachel rush to the hospital and are ready to welcome their baby. However, since there are no private rooms, they are forced to share this moment with some eclectic couples.
One of these couples is aggressively fighting and calling names to each other. At one point, the woman (The Sopranos' Debi Mazar) accuses her husband of leering at Rachel, but once Ross realizes that he’s actually a pervert, the woman shifts and starts fighting Ross for insulting her husband.
#28. Jim Rash
When all the fans could only speculate about Ross and Rachel’s fate in the final episodes of Friends, the Oscar-winning actor Jim Rash comes to provide some comic relief to this situation.
Known as nervous male passenger, he sat next to Rachel on her flight to Paris. When she gets an alarming call from Phoebe, he makes such a commotion that causes all other passengers to get off the plane.
#27. John Stamos
In the Season 9 episode “The One with the Donor,” Chandler and Monica are told by their doctor that, after taking a few tests, they are not able to conceive. The doctor then suggests a few alternatives such as a sperm donor.
Consequently, Chandler invites over his coworker, Zack (Stamos), and secretly see if he would make a good sperm donor. However, the couple makes Zack feel really uncomfortable when they start asking him several health-related questions about him and his family.
#26. Helen Hunt
In "The One With Two Parts, Part 1", from season 1, the award-winning actress Helen Hunt plays her famous character Jamie Buchman, from Mad About You. This was one of the most exciting crossovers in sitcom history.
On that episode, she mistakes Phoebe with her twin sister, Ursula Buffay as they ran into each other in Central Perk.
#25. Dakota Fanning
In the episode _The One With Princess Consuela_ she played Mackenzie, a girl who lived in the house that Monica and Chandler wanted to buy in the suburbs. She and Joey establish a close bond since she didn’t want to leave her home and he didn’t want his friends to leave Manhattan.
Dakota Fanning was only 10 years old when she appeared in season 10\. Before that, she had several guest roles in television series such as _CSI: Crime Scene Investigation_ and _Ally McBeal_
#24. Dermot Mulroney
After Rachel has baby Emma and while she’s on maternity leaves, she attempts to go back to work only to discover that there is somebody else has taken her place: Gavin Mitchell (Mulroney).
Worried about losing her job by him, she decides to go back. While at first, she finds him rude and arrogant, they end up growing fond of each other and sharing a passionate kiss.
#23. Freddie Prinze Jr.
The American actor starred in the Season 9 episode “The One with the Male Nanny,” where he plays the role of Sandy, the nanny who is going to take care of Emma.
While Rachel is so happy to hire him because she thinks he’s great, Ross is shocked to find out that Sandy is a man and also quite uncomfortable by his presence.
#22. Adam Goldberg
Who could forget Chandler's crazy roommate Eddie? His three-episode arc in the second season of Friends is iconic. What better way to summarize Eddie than with Chandler's famous quote: "Hannibal Lecter; better roommate than you."
Eddie moved in with Chandler after Joey got his big break as Dr. Drake Ramoray. But soon they realize they have nothing in common. Not only that but also that Eddie is borderline psychotic. His storming out of the room with the fish is one of Friend's most memorable moments.
#21. Gabrielle Union
The actor appeared in The One With The Cheap Wedding Dress as the new neighbor across the street, Kristen Leigh. In this episode both Joey and Ross meet her and ask her out and she agrees to both dates, not knowing they are friends.
After the two find out, they take her out on one more date with a set spending limit of $100, to see which one she likes better. Spoiler alert: she ditches both of them on Ross' date. You go, girl!
#20. Paul Rudd
Mike, the guy who won Phoebe's heart was a lawyer who had given up his career to pursue his true passion: playing the piano. In that sense, he shared his musical spirit with Phoebe, who has given us wonderful songs like _Smelly Cat_.
In _The One With The Pediatrician_, we meet Mike as a result of a failed blind date that Joey and Phoebe agree to go on. The problem is that Joey completely forgets about the blind date. So right before the date, he goes to Central Perk and begins to shout out the name “Mike” to the four winds, hoping that someone would reply. Mike Hannigan happened to be at the coffee shop, and… well, you know the rest!
#19. Robin Williams and Billy Crystal
Billy Crystal and Robin Williams’s appearance wasn’t in the original script. They were, by coincidence, in the same building, or the one across the street from where the TV comedy was being filmed, and the writers asked if they wanted to make a guest appearance. This all happened on the same day of the shooting so it was just quickly thrown in.
Only these two would dare burst into Central Perk and ask the six friends to move over on the couch. If you’ve seen this episode, you probably remember the awkward moment.
#18. Charlie Sheen
Way back in season 2, Charlie Sheen played Ryan. He’s a military man who, after spending months inside a submarine, comes back to Earth and shows up at Phoebe’s apartment.
We then learn that Ryan was Phoebe’s former lover, and they go on a romantic date, but a huge obstacle comes in their way. Phoebe gets chickenpox, which is obviously super contagious, but Ryan decides to take the risk and kisses her anyway, thus contracting the disease.
#17. Julia Roberts
_Friends_ fans only had to wait one season to enjoy the show’s first great cameo. At the beginning of season 2, Julia Roberts appeared, playing the role of Chandler’s former schoolmate.
Apparently, she was bullied by Chandler when they were at school together, so she decides to seek revenge and play a prank of her own._The One After the Superbowl_ happened to be the most-watched episode of the first five seasons.
#16. Jean-Claude Van Damme
On the same episode, Rachel and Monica get a glimpse of a film shooting starring Jean-Claude Van Damme. Monica gets super excited but is too shy to go and talk to him. Rachel takes the initiative and asks him out for Monica.
However, as Rachel approaches him, he ends up asking her out, to which Rachel agrees. At first, Monica says it’s okay but it turns out it wasn’t, resulting in a fight between the two friends.
#15. Gary Oldman
Gary Oldman played Richard Crosby, a veteran alcoholic actor who shares the scene with Joey in a First World War movie. It’s funny to see such a world-renowned actor play such a strange role on the show, isn’t it?
Joey had lots of trouble when shooting his scenes with the veteran actor because he wouldn't stop spitting him in the face each time he recited his lines. When Joey confronts him, Crosby replies that spitting is a great way to emphasize words. Joey follows his advice, and the two start spitting each other during their scenes.
#14. Danny Devito
Phoebe Buffay was always portrayed as the odd one out, so it was obvious that her bachelorette party would end up being bizarre and out of the ordinary. Well, Phoebe was extremely disappointed when she discovered that Rachel and Monica hadn’t hired a stripper, so they had to look a stripper up in the yellow pages and called the first number they found...
So believe it or not, the stripper, named Officer Goodboy, was played by Danny DeVito. If you’ve seen the episode, I’m sure you vividly remember Danny DeVito’s erotic costume and sexy dance!
#13. Jeff Goldblum
Jeff Goldblum plays the role of a legendary director named Leonard Hayes, who isn't convinced with Joey’s performance in the audition, but gives him a second chance. When Joey auditions for a second time, he is given the role. But do any of you remember what helped Joey get the role?
Joey was told that he had to be more passionate in his acting, so he went to great lengths in order to impress Leonard. And he succeeded in his second audition… due to his dire need to visit the bathroom! But when Leonard tells Joey that he got the role, they hug, and Joey can’t help but pee his pants right in front of him.
#12. Christina Applegate
Christina won an Emmy for Best Guest Actress in a Comedy for her role as Amy Green, which she played Rachel’s older sister, but she’s definitely less lovely and way more careless.
When Amy meets her niece, Emma, for the first time, she can’t even manage to call the baby by the right name, calling her from Emmett to Emily. Then, when Rachel introduces her to Phoebe, she doesn’t believe that Phoebe is a real name.
#11. George Clooney and Noah Wyle
The protagonists of the successful medical drama ER appear in this _Friends_ episode, and they happen to play the role of two young doctors. Rachel hurts her ankle, but she switches identities with Monica so she can use her health insurance.
When they meet these two doctors in the hospital, the four of them agree to go on a double date, but Rachel must pretend she’s Monica, and Monica must pretend she’s Rachel. I won’t spoil the rest of the chapter in case you haven’t seen it yet!
#10. Jennifer Coolidge
Amanda, played by talented actress Jennifer Coolidge, is a friend of Phoebe and Monica, but neither of them can stand her. The best scene is when she tries to seduce Chandler with her horrendous dance.
Before her appearance on _Friends,_ the experimental comedian worked as a permanent actress on the show _She TV__,_ a short-lived TV comedy starring Nick Bakay, Elon Gold, Simbi Khali, and Linda Kash.
#9. Bruce Willis
When Ross gets involved with one of his university students, he expects his father to like him. To his surprise, her father, played by Bruce Willis, doesn't like Ross one bit. After Rachel hits it off with Paul, Ross sets up a double date between the four of them with the hope that Rachel would speak well of him, but as you may imagine, it ended up being super awkward.
Seeing Willis play the role of an evil father-in-law is something you just can’t miss. And Rachel does her part too because she keeps on mentioning anecdotes that make Ross look like a horrible guy, such as the time he said the wrong name on the day of his wedding.
#8. Brad Pitt
Yes, when Brad Pitt appeared on Friends, he and Jennifer Anniston were still together! What makes the episode even funnier is that Brad plays the role of Will Colbert, Ross’s former best friend from high school, who hates Rachel with all his heart.
The famous actor wasn’t the only one of Aniston’s couples who made a small appearance in the production. Another of his boyfriends, Tate Donovan, also appeared in several episodes, playing the role of the attractive Joshua, a client she intended to conquer at all costs.
#7. Reese Witherspoon
In Season 6, her younger sister Jill comes along, and we learn that she’s even more spoiled than Rachel. And who could’ve done a better job than the iconic Reese Witherspoon?
Jill shows up unexpectedly at Rachel’s apartment after putting up a fight with her father, Leonard. She attempts to start a new life, just like Rachel did years before, but Jill ends up breaking the rules: she buys a whole bunch of clothes with her dad’s credit card, and then she dates Ross to spite Rachel.
#6. Hugh Laurie
Hugh Laurie catapulted to fame during the 1980s, appearing in popular TV shows such as _The Young Ones_ and _A Bit of Fry and Laurie_. But a few years before he began starring in the TV medical drama _House_, he appeared on_Friends_ Season 5.
In The One With Ross’ Wedding II, Laurie played the man on the plane sitting next to Rachel. He just couldn’t stand Rachel, considering how extremely anxious she was at the thought of declaring her love to Ross.
#5. Alec Baldwin
In _The One with the Tea Leaves_, Alec Baldwin played the role of Parker, an overly enthusiastic man who briefly dated Phoebe. His irrationally optimistic outlook on life eventually annoyed all of Phoebe’s friends.
So, as they always do with each other’s dates, they start making fun of him behind Phoebe’s back. Phoebe happens to overhear their chat and she gets pissed, but a few hours later she realizes that her friends were right: Parker was just too much to take!
#4. Susan Sarandon
Susan Sarandon played Cecilia Monroe in _The One With Joey’s New Brain_. The actress excelled in her performance and received an Emmy nomination for Best Guest Actress in a Comedy.
Sarandon played a drama actress who was going to be dismissed from Joey’s soap opera, _Days of Our Lives._ As always, Joey's show makes us laugh because of how bad it is. Sarandon's character in the soap opera is killed after she gets electrocuted, and then, doctors transplant her brain into Joey’s character, Dr. Drake Ramoray. How could that even be possible?
#3. Anna Faris
Anna Faris appears in the episode _The One With the Birth Mother._ When Monica and Chandler realize they are unable to conceive, they contact an adoption agency, and they eventually travel to Ohio to meet Erica, hoping she would choose them as her baby’s adoptive parents.
Faris told _Media Village_ that on her first day, she was really intimidated. _"It was also a big thrill to be a part of something so iconic, but mostly I was really terrified"._
#2. Selma Blair
When Chandler moves to Tulsa, Oklahoma in season 9, his coworker Wendy – played by Selma Blair – is more than happy to flirt with him while Monica is stuck back in New York.
Just when Wendy was about to give Chandler a kiss, Monica gives him a call, but gets pissed and hangs up. Chandler impulsively decides to quit his job and travel back to Manhattan, and he takes all his friends by surprise when he shows up moments before Christmas Eve.
#1. Winona Ryder
_The One with Rachel's Big Kiss_ is a chapter that fans won’t forget. In this chapter, Winona Ryder plays the role of Melissa, Rachel's old college friend. We eventually learn that the two of them had kissed. However, Phoebe doesn't believe that Rachel and Melissa kissed, claiming that Rachel was "_too vanilla_" to do something of the sort.
Apart from that, Melissa denies that the kiss ever happened, making Phoebe feel even more suspicious. Rachel is furious with Melissa’s denial and Phoebe’s mistrust, so she kisses Melissa to remind her of what had happened that night