I've done this as well. I only blame myself though. I don't care if the check-out person is unhappy with me checking to see if I've forgotten anything. I've never had one give me the impression they were bothered by the 2 second interruption in their day for me to take a final look.
I've also left ground beef in the trunk of the car, having missed the bag while unloading. I don't recommend it.
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