Bruce Willis appeared on Friends for free!
Bruce Willis, the lovable bald guy who is known for being an incredibly intimidating character in films such as Die Hard, and Armageddon. He also appeared in the film 'The Whole Nine Yards' with Friends star, Matthew Perry. While filming the movie, Perry made a bet with Willis stating that if the film were to make #1 at the box office on it's opening weekend, Bruce would have to make his cameo role in Friends for free!
The film ended up making #1 at the box office, as Perry predicted, and Willis donated all of the money he made from his cameo appearances on Friends to charity. It wasn't all bad for Bruce Willis, because he ended up winning an Emmy for his brief performance on Friends!