That's happened twice. First time, I bought a cart full of drinks. Door greeter asked to see my receipt. I said no, but thanks for asking and walked out.
Second time, bought a pellet gun for my son. The cashier forgot to deactivate the tag and it set the alarm off. I didn't miss a step as the door greeter ran behind me, trying to tell me it was the law that I had to stop. My daughter asked, "is someone looking for a lawsuit?" I said, "it looks that way". That stopped him dead in his tracks.
Second time, bought a pellet gun for my son. The cashier forgot to deactivate the tag and it set the alarm off. I didn't miss a step as the door greeter ran behind me, trying to tell me it was the law that I had to stop. My daughter asked, "is someone looking for a lawsuit?" I said, "it looks that way". That stopped him dead in his tracks.