I don't think you'd ever actually get a good court case out of it. I am in law school, and I know that it would be virtually impossible to prove that you did this on purpose. Even the most rookie trial attorney would say something like that you just left your bike there for a minute while getting smokes or stopping to visit a friend. That the thief jumped on it and killed himself on your property was his own fault. That said, I think its a great way to kill bike thieves like flies!