I’ve always wished somebody would sell anhydrous ammonia in a small areosol bottle the way they sell Mace. A faceful of that stuff will incapacitate any large mammal. You could take down a coked-up Mike Tyson with it. I used to run a diazo process printmaker, so I know of what I speak. My workstation was by a window that kept open year-round. If I wanted to keep the boss away I would simply vent a couple milligrams of gas into the room. My desk area would be clear but the rest of the room was a gas chamber.