![Robin Williams and Billy Crystal with the Friends cast (1990s). Their appearance on the sitcom was coincidental as they were in a nearby set and wandered into the Friends set where they Robin Williams and Billy Crystal with the Friends cast (1990s). Their appearance on the sitcom was coincidental as they were in a nearby set and wandered into the Friends set where they](https://img-9gag-fun.9cache.com/photo/aVwGOOd_460s.jpg)
Robin Williams and Billy Crystal with the Friends cast (1990s). Their appearance on the sitcom was coincidental as they were in a nearby set and wandered into the Friends set where they
![Friends" The One with the Ultimate Fighting Champion (TV Episode 1997) - Robin Williams as Tomas - IMDb Friends" The One with the Ultimate Fighting Champion (TV Episode 1997) - Robin Williams as Tomas - IMDb](https://m.media-amazon.com/images/M/MV5BMTU2NDMyNjEzN15BMl5BanBnXkFtZTgwNTE0MjU0MDE@._V1_UY1200_CR89,0,630,1200_AL_.jpg)
Friends" The One with the Ultimate Fighting Champion (TV Episode 1997) - Robin Williams as Tomas - IMDb
![Season 3, episode 24. I know Friends had other great unscripted moments, mostly by Matthew Perry, but in my opinion, this completely improvised scene with Billy Crystal and Robin Williams surpasses them Season 3, episode 24. I know Friends had other great unscripted moments, mostly by Matthew Perry, but in my opinion, this completely improvised scene with Billy Crystal and Robin Williams surpasses them](https://external-preview.redd.it/48FqLqdh4mHJiBqjtH7UWe9DhUk0oGhuo_Ge4k1LOD8.png?width=640&crop=smart&format=pjpg&auto=webp&s=cbd10b1a86d0080666f8d0423bb96f4db6ed9a9b)