I usually watch the cashier at the grocery store - well, as much as I can while I'm unloading my cart. And I almost always glance at the receipt before I leave the store. But last week, I was tired and in a hurry to get home. I stuck the receipt in a notebook and didn't think about it until I pulled it out to see if I could use it for a rebate I was sending in.
As I was scanning the numbers, I saw $20.72. I couldn't imagine what I had bought that cost that much, so I looked left. And there it was. Fourteen red peppers. Right between the one green pepper and the one onion I had bought.
Of course, I had only bought one red pepper, but somehow it had been rung up as 14. (I have not been able to come up with a plausible reason for how that happened.) I took the receipt back to the store and, to their credit, they didn't ask a single question. Just gave me back my $19 and change.
The moral of my story: ALWAYS check your receipt!