"Janitor 5"

By far the most philosophical of the series, the film opens with the janitor having just finished watching the Back to the Future trilogy. Now despite Doc's clear message concerning the dangers of time-travel, the janitor can't get past how much fun they had, so he builds a time machine (montage) in his basement. His first experiment is going fifteen minutes into the future, where he witnesses the end of the TV show he was watching. The ending ruined if he goes back to the present, he must live life fifteen minutes in the future.