It started with Black Christmas. Bob Clark's groundbreaking slasher film took the then-shocking notion of setting a sorority bloodbath at Christmastime, offering a dark contrast to the joy of the holiday season. Halloween came a few years later, and its success spawned a slew of holiday-themed horror movies. The idea still catches fire every decade or so, retooled for new generations of viewers.Why are these films so popular? It's partly because horror is the bad boy of cinema, always looking for ways to upset the status quo and topple sacred cows. To horror creators, the purity of a holiday is just waiting to be splashed with stage blood. But the deeper reason is that holidays are times when we gather with our families, and that can be joyful and painful. For some, the explicit violence of holiday-themed slasher films brings the angry undercurrents churning around the dinner table out into the open. For others, the shocking juxtaposition of a day of celebration with death and dismemberment is just another part of the play-acting thrill ride of moderated fear.This episode features a deluxe sampler of holiday mayhem, including Black Christmas, Krampus, Silent Night Deadly Night, Terror Train, My Bloody Valentine, April Fool's Day, Happy Death Day and the blockbuster 2018 sequel to Halloween, featuring returning guest Jamie Lee Curtis.