Susan Sarandon, the costar of "Tammy" who plays the titular Melissa McCarthy character's alcoholic grandmother, says it's actually not hard to play a crazy character. In fact, it's pretty liberating.

"I think the first thing that anybody has to do is make fun of themselves. Besides doing hallucinogens, that's the biggest way to let go of your ego. You have to be able to just say, 'OK that was stupid.' Once you're stupid a few times, it's really freeing." 

Check out our interview to discover the movie where Sarandon first learned to let go of her ego and act like a drugged-out lunatic. Also: We ask about her pal Geena Davis and the plans for her ping pong club Spin to go national.