… but these are funny.

Don't pay $.40, buy mine for only $25
Tailgate Sentry [tailgatesentry.com] is a painted white hose clamp that retails for only $24.95! This company identifies a problem (tailgate theft), explains how to commit the crime, then offers a two-bit solution.
CatClamp [catclamp.com] offers $325 $10 worth of steel cables at a $325 price tag. This is another company that demonstrates an exploit then offers a solution that is more than lacking. You see, what you need to do is strap your catalytic converter to the frame of your vehicle. It’s a system that works against thieves without saws. The theory is that when thieves come to saw off your muffler they wont realize they have a saw capable of cutting the steel cable. And yes, the cable can be cut. One user of the system said his mechanic had no problem cutting off excess cable during installation.
Targus Security Lock for iPod – You know that connection on the bottom of your iPod/iPhone that you can just pull right out? Now, imagine it with a combination lock. You can still easily pull it out, but now you can’t charge it because you stuck a padlock in the docking port. Basically for $29.99 you get an iPod USB cable that doesn’t work; I think that’s what we all really want but never had the stones to admit it.
I haven’t included links to the actually products for a few reasons. One being that I don’t want Google to think I support these products. Another being that I’m afraid of what the Tailgate Sentry guy would do if he saw me compare his white hose clamp to a regular hose clamp.
Digital security is easy. Encrypt it and don’t let everyone access it and you’ve done a pretty decent job. Physical security “keeps honest people honest” at best. These products though, it seems they just entice people to steal.