Shockcollar in the gas tank. When they put it in the car, push the button!!

Not sure if that would actually work, but it would be some cool stuff if it did..... Thinking about it, I have an old shock collar in the shed somewhere. I have a project for tomorrow!!!!

Won't work Matt. Has to be in the flammable range.

My subdivision
 

In my area, there was a rash of bulgaries. It was four guys, two in each van. The vans were white, with an extension ladder on roofs. Each van had a magnetic door sign that read "Direct TV". They would park in the middle of day in victims' driveways, and people would just think they were installing/repairing TV systems. They would just steal what they could with no one thinking otherwise. They got caught eventually.