3. This Is Spinal Tap
Probably the most famous and well-regarded example of the mockumentary genre in history, director Rob Reiner's This Is Spinal Tap is one of those movies that even if one hasn't seen it, they've likely seen references to it hundreds of times. Sporting a towering 95% on Rotten Tomatoes, This Is Spinal Tap's hilarious portrait of a fictional British metal band is right up there with Monty Python and the Holy Grail when it comes to comedies that have successfully permeated western pop culture at large. This film goes to eleven.
