I believe that I may have already posted about this woman here before, but when I was working at a hotel, we had an elderly woman staying with us who would swing by the front desk and buy something small (say a magazine, or some stamps) and if it came to $3.85, she would hand us three dollars and then wave her hand dismissively and say that she'd get us the change "later." Of course, we weren't allowed to do that. We needed to key in a purchase of $3.85 into the system and our cash drawer needed to reflect that amount taken in at the end of our shift. So the front desk person would need to insist to this woman that she needed to pay the full amount- even if that meant that we needed a nickel, or 17 cents, or 98 cents more from her. She'd huff and sigh and roll her eyes at us like we were being unreasonable and petty. She tried this every single time she made a purchase with us during her stay. I fear that some of the newer employees that she encountered may have been so intimidated by her manner that they just took change from their own pockets to cover the portion she didn't want to pay, which is what I suspect she wanted all along.