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Neighbor had air horns on his truck for years. Very tempting to use them in situations where needed BUT one day he was followed home and threatened by a guy who he 'horned'. Another time he used it the people got his plate number, state patrol showed up at his home and wrote him a ticket. He has since removed them before someone kicks his ass.
if he followed him home, set foot on his property, and threatened him then I’m pretty sure he’d crap his pants again if your friend had a “incentive changer” on his hip or hand.