Very good ideas. Although evil, I would have no qualms about doing these things. I'm especially interested in the battery/capacitor method. Anyone want to explain how to do this??
There's only one main drawback I can see to all this. Some guy is gonna come along only intending to rip off the hood ornament, and then as a result gets nicely bloodied up and/or fried. This might piss him off bad enough to where he now wants to REALLY f*** your car up (i.e. keying, denting, busting out some glass) whether it be at the time or if it means coming back later. Just something to think about.