Sometimes I'm almost disappointed that package theft has been so low in areas where myself and most of my cohorts live. It has occurred to me how amusing it would be to rig up fun bait packages like that. Glitter bomb, cans of spraypaint with a mechanism to burst them open, jar of feces with a blasting cap in it, an entire bottle of "Liquid Ass", etc. You could use a very simple mechanism to start a timer when the package is tilted so that it blows inside the perpetrator's car as they're driving away. Maybe an extremely loud siren that is sealed up with its power source inside an inner box strong enough to take them some time to get into it to stop the thing. Another idea I had was make a movie prop style fake bomb that looks like sticks of dynamite strapped to a timer that starts counting down so the thieves crap their own pants when they open the package. I don't think there's any law against having an inert movie prop in a box on your porch.