Paul Rudd was almost fired from FRIENDS after accidentally injuring Jennifer Aniston.

Paul Rudd is now best known for his role as Ant-Man in the Marvel Cinematic Universe, but fans of FRIENDS know him best for playing Lisa Kudrow's on-screen partner, Mike Hannigan. Despite only appearing in a handful of episodes of the hit TV show, Rudd quickly became a favorite of many and continues to be one of the most beloved 'Green Flag' characters of all time.

However, the actor revealed years after the show ended that he thought he was going to be fired on his first day on set after badly injuring co-star Jennifer Aniston.

Paul Rudd's Mike Hannigan was only introduced in the last of the NBC hits, FRIENDS. After appearing in just a few episodes of the show, the actor's character is now an indispensable part of FRIENDS, and fans of the show would have a hard time imagining the story without him. So great was his popularity that his character was written into a few more episodes despite appearing in only a few.