Well I saw one play where he tries to engage the DT at the snap of the ball, only to be clubbed inside as the DT runs right around him for the sack. It was funny looking because he tries to hop backwards to catch the would be sacker. As a result, he gets himself airborn with no feet/footing under his moving body. Needless to say, he made a butt landing as his guy hits Kitna stepping up in the pocket.
Don't get me wrong, there is nothing funny about our QBs getting hit. He just looked comical landing a "perfect form" of a butt flop.