This 1980 slasher movie has earned a cult following in the decades since its release. When young Harry (Brandon Maggart) sees Santa touching his mom on Christmas Eve, he's scarred for life. (Don't worry, it's just his dad dressed up as Santa . . . but Harry doesn't know that.) He grows up, has a mental breakdown, and convinces himself that he's the real Santa — and the people on his "naughty" list need to be punished.