"Eyyy buddy, you wanna buy this car? Classic 1991 Honda Civic, only 100k miles on it, and most of the doors still open. I'll give you a deal, $10 000."

"Yeah, I don't think it's worth that much. A hundred dollars, tops."

"Did you just appraise this car? Oh, you done messed up."

muffled sound of approaching police sirens

EDIT: Hah, didn't see you'd used the exact same analogy elsewhere.