He Had an Infamous Cameo on “Friends”
Friends is known for its epic cameos, featuring appearances from Brad Pitt to Julia Roberts—and Robin Williams. He’s seen on the show with longtime friend Billy Crystal, but the cameo wasn’t even in the original script of “The One With The Ultimate Fighting Champion.” Apparently, Robin and Billy were in the area where NBC was filming the show, so the producers asked if the guys wanted to make a quick cameo. Billy played “Tim” and Robin, “Tomas.” Much of their dialogue was ad-libbed as well as the cast’s reaction.