I couldn't find an Absolute Stupidity thread, and I suspect this cashier is on her way out of a job, so putting this here.
Yesterday at the grocery store, I was coming down the bakery aisle and witnessed a woman getting a special order cake from the bakery. She and the bakery worker were very careful in handling the box and getting it settled in the woman's cart. I grabbed my stuff and headed up front.
Got behind cake woman in line. The box was a not-terribly-large, rectangular box, and had the order slip with the bar code price tag attached taped with one piece of tape to the top of the box. Cake Woman took the order sheet off the box and handed it to the cashier. All the cashier had to do was scan it. Nope. The cashier demanded that the woman place the order sheet/barcode back on the bakery box and place the box on the belt. The woman very carefully lifted the box out of her cart and sat it on the belt as instructed.
The cashier grabbed the box, flipped it upside down and attempted to scan it. The order sheet fluttered, so she kept at it, running the box back and forth over the scanner. She finally turned the box upright, tore off the order sheet, and scanned it. She then took the box and placed it on end in a grocery bag, having to push the sides of the box in to get it to fit, pulled the bag off the stand and laid it on the counter, with the bakery box upside down. During the original flipping of the box, I could see this mishmash of icing on the window in the bakery box, so the cake was a mess. Having the sides of the box compressed probably didn't help.
Cake woman stood there in wordless shock, with her mouth open. The cashier said something to the woman about paying.
I got in another line, and as I was leaving, Cake Woman was still there, but the manager was present.