01/19/2012 10:11 am ET Updated Mar 20, 2012

Michael Fassbender: Viggo Mortensen Sits In A Corner Naked, Eating A Banana (VIDEO)

He may play Freud, but it sounds like Viggo Mortensen could use some psychoanalysis of his own. Or, at least according to Michael Fassbender.

After Mortensen appeared on the "Late Show" last week and told host David Letterman that Fassbender, his "Dangerous Method" co-star, prepares for scenes by jumping repeatedly on one leg, Fassbender got his revenge. Offered the opportunity to make up his own story, Fassbender told Dave that Mortensen likes to sit naked in a corner and eat a banana before filming.

It was a good laugh, and yet another nationally televised phallic joke involving Fassbender. During Sunday night's Golden Globes, George Clooney thanked the German-Irish star for taking up his mantle of full front nude scenes in movies -- Fassbender went completely naked in "Shame" -- and complimented him on his anatomical gifts.

Fassbender appears -- clothed -- in this weekend's Stephen Soderbergh action flick, "Haywire."