This peppy horror mashup with existential airs goes completely nuts in its final half-hour and is all the better for it. Five college friends pile into a camper for a frolicsome vacation. Early on, we’re shown that they’re being watched very closely, and perhaps controlled, by two handlers in a massive control room. Cue the killer redneck zombies, cheeky winks to the beloved genre and, not to spoil anything, but … a killer unicorn. It’s a self-reflective horror film, and it works.