Robin Williams as Tomas
Robin makes a cameo in Season 3, Episode 24 “The One With The Ultimate Fighting Champion” alongside Billy Crystal as Tim. Their appearance on “Friends” was rather serendipitous; both actors were filming on a nearby set and the “Friends” writers approached them about being on an episode of the show. Since the cast of “Friends” was filming that same day, the scene with these two A-list actors needed to be added to the episode and filmed. With this scene not appearing in the original script, most say that the entire scene is completely improvised.