Ben Stiller
Known for playing hilarious yet neurotic characters, Ben Stiller is completely different in real life. Apparently, Stiller doesn't have a funny bone in his body. He is also said to be egotistical and unreasonable. On the set of Meet the Fockers, Stiller earned himself the nickname "Little Focker," since he wasn't content unless he was being attended to constantly. He even threw tantrums until he got his way.