Have you ever seen Dr. Katz, the genius animated show about a therapist and his grown son? He'll give sessions to his patients, but each patient's voice is actually a famous comedian (Conan O'Brien, Ray Romano, David Cross). One summer, my brother and I got totally obsessed with it and watched it everyday in Michigan. Well, this morning, I came across this clip and couldn't stop laughing.
(Now I'm tempted to buy the dvds and watch the full season:)