This happened a few weeks ago, but as we were closing the registers for the night and helping the last few customers, we had a sit in.
An adult lady, upset about not getting a cash refund from a credit (not debit) card purchase threw a tantrum and sat in the floor.
She had purchased an item on her store credit card, paid the card off, and then wanted to return the item. Since the card didn't have a balance, she felt like she deserved to be given cash, however, we don't do cash refunds on credit purchases. We can do cash refunds for debit card purchases, but only since debit cards are technically "cash" tender.
I know from experience that our store card gives a credit if you return an item and have a $0 balance, and if you really want that back as money, you just call the card company and they'll send a check with your next statement. Or the next time you make a purchase, the credit is applied towards that purchase. It's not a terrible arrangement.
Instead of doing any of that, she sat in the floor, told the manager on duty she wasn't leaving until she got her money, and refused to leave even when he said the police would be called. This was all happening ten minutes before the store closed, so the manager, not wanting to keep anyone late because of a ridiculous customer, gives her a cash refund.
Thanks to him doing that, we got out on time, but he was not happy about having to give her what she wanted. Had it not been time to close, he would have put her through the embarrassment of a police removal. I'm kinda sad he didn't do it anyways.