Have you ever done anything pleasing but it was evil?

Once, I noticed a chain message going around about a "Woman killer" (who was obviously fake) that killed up to 50 people supposedly. It said "If someone by the name of "Jokester59 (or something) tries to contact you, DO NOT ANSWER TO HIM!"

Well, I got a screename similar to that, and started contacting the chain-mail followers. It was hilarious, and I was laughing the whole time.

Share your guilty pleasures.