Seems like a good thread... cult classics work in here too...
Under appreciated recent movie I just saw again while up w/ a crying baby at 12am was Idiocracy (Mike Judge Movie) about a guy who wakes up in the year 2500 as the smartest man in really degraded society...
http://www.imdb.com/video/screenplay/vi1526530841/
Cult classic:
Army of darkness, hands down one of my favorite inane movie to watch....
http://www.imdb.com/video/screenplay/vi3253863193/