Penn had a monkey-induced life changing event... Penn and his friend Barry Marks got a copy of the original movie Tarzan and his Mate, which is full of violence. In the movie, Cheetah (the monkey from last week) is smoking. Penn was laughing so hard, he had to pee, but wasn't able to walk to the bathroom, so he had to crawl. Which Barry thought was hilarious, so he made sure to follow him closely all the way to the bathroom.