Also worth mention are the Three Stooges movies. Utterly horrible movies meant to capitalize on the Stooges fame at the time, but terribly written idiocy, it makes the old Stooges television shows look like masterpieces by comparison.
IF we later find that Mars in fact actually has a hidden Martian civilization, they will consider Santa Claus Conquers the Martians as one of the many war crimes the Earth has committed against Martian-kind.
And yes. That film has been mentioned here as well as the worst Christmas movies thread. And deservedly so. But at least theversion with the Rifftrax commentary track is exquisitely funny because of how bad that film is.