Speak softly and carry a freaking huge Gatling gun attached to a wheel barrow.
To move the device, just be like, "Hey, go over there." ~Not-So-Handy Andy
This should have been the only trap set in Home Alone 4, with the rest of the movie a thrilling court drama about whether or not to try the boy as an adult for manslaughter.
But sleeping with up to 30 guns in a rifle bunker underneath your bed?