The Bloody Nightmare strips the Bloody Mary concept down to its most essential — and darkest — form: vodka, lime juice, and cranberry juice over ice. No tomato juice, no Worcestershire, no elaborate garnish tower. The cranberry’s tartness and deep red color give the drink its ominous name, while the lime adds brightness. It’s a Bloody Mary for people who don’t actually like Bloody Marys — cleaner, simpler, and far less savory.