This is Spinal Tap – 1984

This music mockumentary is funny because it’s all ad-libbed. Originally written by Rob Reiner, he had to give Christopher Guest, Michael McKean and Harry Shearer writing credits because they made their own shit up, and the film is better for it.

Plus the scene with the dramatic piano song, in a depressing key, that he calls “Lick My Love Pump” makes me laugh to this day.