Perhaps the first, and certainly the best, entry into the mockumentary genre. Spinal Tap is responsible for so many American aphorisms (like "turn it up to 11") that it ought to be in the National Film Registry. Insanely funny.

Of special note is the new Special Edition DVD for the film, which features more time in extras than the entire running time of the film. Over an hour of outtakes could effectively make a new film, and a commentary track features the original cast -- in character -- discussing the movie ostensibly about them. Talk about mud flaps!