The reason Christopher Guest movies are funny is they poke fun at people who take themselves waayyyyy to serious. Musicians, dog owners, etc.
Most, as has been mentioned, are ad-libbed and done in mocumentary form.
It's not so much as the film is funny, it's the whole premise. My favorite part of Spinal Tap is when they show him writing a love song. He's playing this pretty piece on the piano when Reiner askes him what it's called, he says "I call it Lick My Love Pump."
Everyone knows people like the ones in the films. That's what makes it funny.
At least for me.
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