On a serious note. People I used to work at a grocery store with would laugh at me because I'd buy 2 liters when I went on break. However a 2 liter of Pepsi was $1 on sale, while the 20 oz. never went on sale and was $1.39 at the time. I tried to explain that to people but they wouldn't hear it.
Yeah a lot of people do that at my store. They wrap the receipt around it and keep it in the fridge until later.
Some of the customers at my store are reaaaally dumb though. I overheard two girls talking in the cookie aisle once and one of them was complaining that with all of the Oreo varieties, they never made any Oreos without the cream in the middle. I lowered my head and kept walking
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skull