From a similar thread:

I work as a bag boy. I am also in charge of bathrooms, garbages, sometimes stocking, clearing the lot of carts, and keeping the store clean. Doors are locked at 10:00, customers out by 11:00, and store closed at 12:00. We have a night crew that works until daylight. It consists of less than five people, at most. The Automatic Door. The front doors are inbetween the bathrooms and the deli. I was pushing a mop bucket to the bathrooms to clean them, it was about 9:15, not many customers, and only a few workers still there. I noticed that the door closest to the deli that connected the store to the cart room would open, then close, open immediately after it closed, then close and repeat the process. The cart room is surrounded by windows, so I looked inside and no one was in there. I got the attention of a woman who worked in the deli and she saw it too. It was likely a mechanical malfunction. The Lone Box of Crackers. I was listening to a co-worker tell another that the freezers sound just like two people talking on the next aisle over due to the strange sounds they make at night and how six cups of yogurt went missing without him noticing. The second co-worker responded: "Yeah, when your mind is tired and your body is fatigued and the whole store is quiet, it really plays with your mind. Once I restocked the entire store and went back to do paperwork when I noticed a box... of snacks, or crackers, or something, just standing upright in the middle of the aisle. Now, it may have been some miracle of nature that it landed upright and somehow got to the middle of the aisle. But I just re-stocked that not an hour or so earlier, there was NO ONE in the store. How the hell does that happen? The Other Parking Lot. The lot I use sits in the back of some businesses right next to my store. I'd sit in my car during break and listen to music and have a snack. Multiple times, I've seen cars parked in spots in the back that turn their lights on and leave after awhile. I suspected that it was just kids doing drugs in their car later at night. Once I saw a person walk alongside a fence and crouch next to a post in the bushes for over ten minutes. By far the strangest thing I've seen in that lot was a truck was parked next to a dumpster and a man with a flashlight was going through it. He probably threw something away after moving his business out of that little center next to my store. I've had a drunk person offer to ride in my trunk when he needed a ride uptown. I declined. I've seen someone buy a box of condoms and a zucchini through self-checkout. I've even seen someone leave freshly-soiled underwear in the men's bathroom. But never will I forget the light that flickers off as soon as I look at it when I'm doing carts alone at night.