"I don't fire warning shots.
I fire warning bursts."
I'm reminded of the guy who was [snip long buildup] backed into a corner by a murderous thug. Guy, a machinegun engineer, pulls out his "take home work" and fires a warning BURST over the thug's head, causing some $50,000 in damage to an adjacent building. Thug: "I'm not afraid of you and your f-ing machinegun"; stupid last words.
But back to bumper stickers.
"This car protected by a 12-guage pistol."