Ben Affleck is doing all kind of dirty jokes on the set of "Surviving Christmas". A few days ago, he shocked co-star Christina Applegate by flashing his genitals to her

She said: "They were doing a shot of a briefcase and Ben just decided to put his 'stuff' on the case. "It was gross. Christina added: "He would always do stupid things like that. He's very goofy".

The movie-maker declared that he's living on edge every day while filming because he never knew when the heartthrob was going to pull the disgusting stunt, reports Femalefirst.

He said: "I'd be sitting in the director's chair and every once in a while I'd feel something on my neck I'd be like, 'What was that?' And I'd turn around and he'd have his scrotum out and resting on my neck I was like, 'What is wrong with you, dude?'".