saw multiple videos from one guy with an outside surveillance system monitoring his signs so he would know when someone had crossed into his yard. he would camp out on his porch and shoot people with paint ball guns when they grabbed hold of a sign (had one vid of a guy pissing on one of his signs and he opened up on him with the paint ball gun; dude took off and pants fell to ground, he did a nose plant on the street), hooked an electric fence up to the wires that stick in the ground, installed a sprinkler system to a pump that he'd switch on that was being fed from a concoction of skunk and doe piss, rat traps taped to the back of the signs, and other pranks on the sign thieves.