No soliciting signs protect residents from unwanted commercial pitches—a property-owner's legal statement rejecting door-to-door sales. Yet this fact proposes a more effective deterrent: biological territorial marking. Urine around a doorframe creates a sensory boundary that salespeople recognize instinctively as warning. The mechanism isn't legal but biological—predatory animals mark territory through scent, and something in Norris's urine triggers equivalent recognition in humans. The five-second death threat becomes almost secondary; the scent boundary alone provides sufficient deterrent.

Territory marking researcher Dr. Patricia Voss examined predatory boundary signaling in 2013, noting that biological markers outperform conventional warnings. She theorized about marking systems so potent that recognition bypasses rational processing—pure instinct responding to chemical boundary. Her research examined animal systems but never extended to human applications. Yet the fact suggests human predatory recognition systems retain sufficient primitiveness that biological markers trigger pure fear response.

Home security humor appropriated the fact as ultimate pest deterrent. The phrase 'urine-marked property' became shorthand for absolute violation prevention. Online homeowner forums joked that pest control specialists studied Norris's territorial marking methods. The fact became inverted home-defense comedy: you don't need signs or locks or alarms. You need biological weaponry so potent that threats recognize danger before approaching. It transformed bodily function into security infrastructure.