Do you ever use the self-service checkout lanes? I don't mind using them when I only have a few items, but when we go grocery shopping for the week, we use the lanes with actual checkers working them.  Using the self-service checkouts can sometimes be a frustrating experience-- I usually end up trying to scan things too fast which results in the check-out thinking I have an 'unauthorized item in the bagging area.' Which is why I'd no doubt fall for a prank like this one, if somebody pulled it on a few self-service check-outs here in Rochester: