Why can't Ben Affleck be this funny in movies?

This is one of the weirder videos I've seen. It's a clip of Ben Affleck being interviewed a few years ago by a Montreal reporter named Anne-Marie Losique. I should say attempts to interview, as he proceeds to flirt and pawing the reporter as she has a giggle fit and doesn't really attempt to get the interview back on track. Looked like foreplay a little bit. Not the classiest display: I don't think Ben's drunk (he realizes he goes over the line as he makes a Cerebral Palsy joke), just being a goofy jackass and flirty in a bad French accent. Tres professional on Ms. Losique's part. Brian Linehan would never act like that. Mind you, Ben is less likely to paw at Brian Linehan.