I was flipping through my deadtree archive of magazines recently when I came across an ad for an ingenious little door alarm in 1906. Granted, it’s not fancy. But it probably did the trick.
At first glance, the self-contained Burglar Blaster security system seems neat. It's quick to set up, covers up to 2,000 square feet, and will stop intruders with a shower of pepper spray. Nothing could go wrong with that, right?