OK: Mild spoiler alert: Everyone eats delicious shrooms, but the girl who eats the fictional poisonous one... Everyone has a blast... But the poisoned girl, who goes ape shit. I dont see much propaganda against shrooms, just the poisonous apeshit driving ones which are, as said, fictional
::spoiler:: Yeah, but when the chick stops tripping, she realizes that the "killers" were only her imagination, and in reality she killed all of her friends while tripping on shrooms.