Troller: You're on the right track ma-man. Could be a simple as leaving some cash sticking out of your ash tray. It's the first thing they are gonna grab. Except within the roll of money you could hide a small amount of Hydrocloric or Muratic Acid in, say a small toothpaste container with the top half cut-off. When they grab it, it ouzes out on their hand. That's bad shi%, man. He's one hurtin' MF'r.

Just clue your turn around guy in to leave it alone.