“Secret Santa” (* out of four) was a perfectly dreadful horror melodrama about a family of whiners and complainers (Michael Rady, Drew Lynch, Debra Sullivan, and others) who gather for a Christmas celebration and soon find that their holiday punch has been spiked with a lethal drug that turns them all against one another involving deceit and murder. But since none of them are particularly likeable in the first place, it hardly matters and you may wish the punch was spiked with cyanide instead. Christmas-themed horror dreck like this is enough to turn anyone into a Scrooge. Unwatchable movies like these make the original “Silent Night, Deadly Night” look like “Casablanca” by comparison.