Poisoned Candy

Alright, listen up, you big dummy. You thought you were getting a sweet treat, didn't ya? But then the joker says "it's poison!" The humor, for simpletons like you, comes from the sudden, unexpected, and totally dark twist. It's like, one minute you're happy, the next you're... well, poisoned. It's funny because it's so messed up and you probably didn't see it coming, because you're, you know, not smart.