This goes back a few years to when I was a manager at a small electronics store. A guy walks in and is looking around, I greet him and he starts saying "wow this place has changed in a few years".
I ask him where he's from and he says he's a local but that he used to work here, so we talk about how things have changed. After a bit he explains why he came in and that was so he could return his alarm clock but says he doesn't have a receipt.
I say I can try to find it but he bought it from another store and we couldn't look up other stores receipts. So I take it to the counter to see what I can do, I scan it and it rings up $2.96.
At this point I'll mention that this clock is at least a year old but it has the original box in good condition. I was feeling pretty good and these were a hot item so I knew we could sell it easily, I say to him "so without a receipt I can only exchange it at the $2.96 price" he then flips his lid and starts saying "I bought this last week for $10", "I used to work here and this is how I'm treated", etc. He then asks to speak to the manager -this is where I got my flair from- and I reply "I am the manager" (That's also why I was willing to exchange it without a receipt and beyond the 30 days). Now he just wants the money back and at this point I just want him out of my store so I decide to refund him the $2.96, he storms out and I never saw him again.