The first last scene during the ending credits
It's soooooo funny.
The scene where Dave is sitting beside Ginger while she's sleeping and trying to eat his bag of chips is hilarious. I laughed the most at that one scene than the entire movie. Priceless chip-eating reaction. The scene after this one was funny as hell too. Dave made The Selling THAT much more enjoyable.
Fun movie overall though with lots of cheesiness and dark humour.