I'd have to asy my favorite patient is Patton Oswalt (in "Movies" (5-02) and "Miles Away" (5-09)) - I love when he tries to get Dr. Katz to be his arch nemesis - "Advantage KATZ!"
David Duchovney and his whole hiding in the closet so people can't see him thing was really funny too, and one of my favorite moments on the show.
I also loved when Sarah Silverman came in, and she and Laura just sat there saying "hi" back and forth (Laura Silverman (Laura the receptionist) is Sarah Silverman's sister).


