I saw Neil Hamburger's show in a club a few months ago. It was a good time...people chanting, "Neil! Neil!" and others heckling him. It's mostly rather mean-spirited jokes about celebrities. It's perhaps horrible to admit, but the ones about the Red Hot Chili Peppers and Heath Ledger had me laughing the hardest.
hilarious
Letterman - McDonald's Drive-Thru
http://www.youtube.com/watch?v=AtPGdOs7zOM
Letterman - Taco Bell Drive-Thru
http://www.youtube.com/watch?v=T0wRLzIVxdY