I have a tripwire just outside my bedroom door. There is a double barrel shotgun pointing down just above the door. If the tripwire is activated it does its job.
I remember a case from several years ago where a farmer had a house that someone kept breaking into. He set up a booby trap for the burgler. Sure enough he broke in again and was shot but not killed by the booby trap. Now the burgler owns the farmer's farm.
(Luke 11:21 KJV) When a strong man armed keepeth his palace, his goods are in peace:
(Luke 22:36 KJV) Then said he unto them, But now, he that hath a purse, let him take it, and likewise his scrip: and he that hath no sword, let him sell his garment, and buy one.