One time some punk kids asked me to buy them a keg of beer for their stupid under age party that would suck. They said I could totally come to the party if I got it for them.
So I inquired at the beer distributor, and they managed to fill my order with surprising ease. They even delivered the keg to the kids and charged the deposit to their parents' credit card I demanded they supply as collateral (in case the kids didn't return the keg and tap).
I never showed up at that party, but I was sure to mail the credit card, receipt for the purchase, and a note explaining the dangers of A) soliciting older dudes for alcohol and then surrendering a credit card and B) inviting older dudes to house parties, to the parents of the kid who solicited me. As a post script, I wrote, "Please ask the suckers if they enjoyed the root beer."