Where I currently work part time, we have sensors at the doors in case someone tries to leave with merchandise. Sometimes, however, the sensor goes off when someone walks in the door. Usually they ignore this — being instructed by a recording to see a cashier because we forgot to desensitize a product tends not to phase people who haven’t bought anything yet.
Yesterday, two people were walking in the door at the same time, though not shopping together. The first one set off the sensor, but they both ignored it and kept walking. I know it was the first person, because they set it off when they left, too. The second person checked out several minutes later and, as they were walking to the doors, turned to me and asked “Why does this door talk?”
I tried to explain it quickly, without laughing, and wrote it down on a scrap of paper.