Originally posted by BayAreaTLS
Actually I think the way the thieves have been doing it is with some kind of tool to pull off the bumper, then they go in. I have not seen it though so I am not sure.
If they are pulling your bumpers off, the best thing for you to do is parking head first against the wall as close as possible. Get an Autolock (I'm sure you've seen it on TV), lock your brakes, so even if they get into your car, they can't move it. I know this sounds like a big hassle, but it is better than loosing your headlights.