I think that the funniest from this was Elaine. She would do anything to proove something from someone, like in this case, this guy who she thinks pretends to be deaf.
I loved it when she´s at his office behind him telling him sexy phrases. But then... Peterman hears her and his reaction is hilarious. So he tells her that they should go out on a date, unless of course she was making fun of his handicap, because that would be a reason to fire someone!!! Hahaha, the things he says. And then, at the end when Jerry and George try to escape, Elaine pays what she did to the poor deaf guy.