The Best Celebrity Cameos and Appearances in 'Friends'

Billy Crystal

Billy Crystal once starred on the TV show Friends as another crazy character. When filming "The One with the Ultimate Fighting Champion" in season 3, he was there to stop in for a cup of coffee. He improvises a hilarious exchange with another celeb...Robin Williams!

Jon Favreau

Jon Favreau is a directorial legend, but he was once just Pete, Monica's season 3 love interest. Pete dropped her and everything else to pursue his dream in UFC fighting. Jon however went on to direct films like Chef, Iron Man, and The Avengers.

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The More You Know

  • The original pilot for Game of Thrones was judged to be so bad by the studio that the series was nearly cancelled.
  • The sound of doors opening and closing on Star Trek is a flushing toilet.
  • Jerry Seinfeld refused to do a 10th season of his incredibly popular sitcom, turning down an offered $5 million per episode. He wanted the show to go out on a high note.
  • The Cosby Show: Sondra was almost played by Whitney Houston instead of Sabrina Le Beauf...but she turned down the role to pursue music.
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Post originally appeared on Upbeat News.