If only gun traps were legal!
Back in the 1960's, there was a little country store a few miles down the road from us. It had been broken into a few times and the owner set a trap gun aimed at the front door, a 12 gauge shotgun. His daughter lived behind the store, and went down there one night to get something, forgot about the gun, and opened the front door. Lucky for her the blast caught her high in the shoulder and didn't kill her.
About a year later, someone broke in, and the daughter called her father. The old fellow came over, and caught the thieves still in the store. One thief was holding the door, and wouldn't let the old man in, so he shot through the door several times with a 22 pistol. That opened the door alright. It was pretty apparent that the owner did not like a thief.