This isn't bad enough to be PD, and we'll continue to shop there since it was likely a one-off, but this was SO frustratingly dumb:
We went to Lowe's a few days ago to look at flooring. One particular type seemed good so I decided to buy a sample which was 25 cents. That was my only purchase, so DH took our daughter outside to wait.
This Lowe's doesn't have self-checkout and only two registers open at the time, so I settled in to wait (mistake #1, should have ditched the sample and left). Then a third opened and called for the "next" person, so being a good eHellion, I motioned for the guy at the head of the wait to go first, then followed him (mistake #2, I was physically closer and with only one small thing and change ready, would have been out of there before the other guy had even walked over). Then a fourth register opened up right next to it and I stepped over, to be helped immediately by Useless Cashier (mistake #3).
I put the sample block down on the counter, label up, to be scanned, and I had to direct Useless' attention to it since he had taken to staring at me blankly. I also had out a quarter and a dime, which I handed to him (I didn't note that he didn't say the cost out loud, $0.27 after tax). He took the coins, dropped them in the till, and closed it. I looked at him expectantly, and he said "Oh! Your receipt" and handed that to me. I said "You still owe me 8 cents..." which he had to think about, since according to the receipt, he had put that I gave him 27 cents in change. With two coins, but that's beside the point.
Now, it turns out that a cashier can't just reopen the register, so he had to call for a manager. No one picked up on his first try, so he tried again. Put the flashing light on, used the PA system... Nothing. In the meantime, I'm weighing the fact that I'm wasting all this time for 8 measly cents while my family is getting antsy, but I could not believe it could take quite so long. In the meantime, rather than apologize the cashier told me a really dumb (totally G-rated) joke, like that would help. No one got behind me in line, fortunately, or unfortunately since he had no chance to open the till again for another customer.
DH and DD walked back in to find out what's up, DH thought it was ridiculous that I had been waiting for five minutes for 8 freaking pennies, and just then a manager finally showed up. And he tried to scan his card to open the register, and it failed to scan. THAT was the last straw. I didn't even bother to explain to the manager (I could not have done so calmly and there was nothing that would rectify the situation at that point), I just said "This is ridiculous" and walked out.
I let a cashier's incompetence and stupid wait for 8 cents drive me up the wall. Grr.
I didn't even think it was a "pocket the change" scam, the cashier was just too clueless for that, but I was darned if I was going to leave until at least a manager showed up. Sheesh.