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In the Coffee Shop during the "Free the Sperm Whales" mission, heading into the bathroom, clicking the foot icon on all 3 screws on the broken mirror and then clicking the foot icon on the skull drawn on the side of a stall will trigger a secret cutscene. Butt-Head will pull out a shotgun, say "$&*@ You Beavis" and shoot Beavis in the head.
Contributed by KidDivinegon