Mine: 1) Spinal Tap 2) Waiting for Guffman 3) Best in Show 4) The Mighty Wind Still haven't seen For Your Consideration of late. Guest rules, not to mention he is married to Jamie Lee Curtis - Hey Now! EDIT: And I mean among the mock documentaries he makes, not all his movies like The Princess Bride.
Spinal Tap Best in Show was funny. For You Consideration bored me to tears. It's probably funny as hell for Hollywood people, but I thought it sucked. That said, that type of comedy doesn't usually work for me.
I keep on hearingt that Waiting for Guffman is brilliant, but to be honest the only one I have seen is Spinal Tap