While on principle I'm not going to condone poisoning anyone anyway, I'll say there's an extremely mixed track record on revenge making the reveng-er feel less angry in the long term. But I don't know if anyone's actually done a study on it. [Probably not.]

Um.[She thinks a second about the question.] A hormone is a substance that your body releases in response to certain conditions that creates a bunch of different effects depending on what the hormone is and how long it's released. You know how you can run faster if you're really afraid or your heart beats harder when you're really angry? Hormones.

[She's gonna skip things like the thyroid gland for now, because she doesn't want to actually piss him off. Or anyone else who's listening and didn't sign up for a science lesson.]