Everyone has seen the guys on the street that scream at you about the end of the world. Here's my plan for the ultimate payback. Join their cause (or whatever) and make sure that when you die, the two of you end up in the same place. Once you both show up on the other side, put together some signs and start screaming about how the end of whatever that place is coming and that they need to repent before it's too late.
Oh man, what a burn.