Something Very Bad Is Going to Happens bloody ending, explained

Well, Something Very Bad Is Going to Happen lives up to its title. Something very bad does, in fact, happen at the wedding between Rachel Harkin (Camila Morrone) and Nicky Cunningham (Adam DiMarco), leaving gallons of blood and countless dead Cunninghams scattered across the reception's dance floor.

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Despite what all the blood might have you think...