What is your favorite mockumentary motion picture?

Piggybacking off of yesterday's poll, What is your favorite Christopher Guest mockumentary?, let's broaden the field to include all mockumentaries.

Wikipedia lists over 100 mockumentary movies. For sanity's sake, only the major and better known mockumentaries are included in the poll. Listing all 100+ would have been overwhelming. No one needs to have a panic attack taking an online poll.

If your favorite mockumentary isn't included as an option, please vote for "Other" and then post the name of the film in the comments.