Director - Judd Apatow

Crafting a good and funny insult is one of the hardest things to do but Seth Rogen and Paul Rudd are two of the best - proving it in this scene of put down jokes.
This entire exchange between Pete (Rudd) and Ben (Rogen) while in the car was completely ad libbed by the two actors. The scene is only a few seconds long on the final cut but as an extra on the DVD, the scene goes on for over six minutes.