I don't mean to "one up" everyone here, but I think my shopping story wins the prize.
A day or two before Christmas, about 15 years ago we "had" to meet our in-laws at a WalMart is a bad part of East Houston (Why? Thats another story for another time). In this particular Walmart, probably 50% of the customers do not speak English, those that do are likely on Welfare, and petty crime is high. Begrudgingly, we got in a line maybe 20 deep, since there was only 2 or 3 registers open for the whole store open at 10 PM.
After almost a whole hour of excruciatingly slow progress, we neared the register, maybe 5 back. We had noticed an eccentric looking woman ahead of us. She was dressed like she just left Woodstock, stuck in the 1960's. It LOOKED like the items in her basket would check out quickly though, coats, a blanket, etc. We were just close enough to see her unload. The large items came out first, but below them she had close to 100 tiny objects, decorations and such that have to be rang up individually. Sigh.
Now comes the good part. After taking FOREVER to ring all the tiny things up, her bill was totaled, and she wanted to pay cash. She slung a heavy large purse off her shoulder and DUMPED a large mound of loose nickles, dimes, and mostly pennies on the check out lane, some which fell to the floor and rolled around among everyone's feet, and some jammed the moving belt. An audible groan went up from everyone in line.