I am the law!
From the top of my head, I remember one incident when I was working in an independent games shop.

Guy came in with a purpose, produced a game from his jacket (which he bought brand new from us earlier) and proceeded to open the box to show us the contents. Inside was a PSX cd clean smashed into 3 pieces - I suppose you can guess what happened can't you? Yep, the guy began putting forward his case for a refund, which went something like this:

Guy: Look it's broken, I want a refund.
Us: You can't have one I'm afraid, we don't sell games broken like that.
Guy: But I didn't do it, I'm telling you I bought it like this!
Us: But we personally check all games before selling them, we wouldn't sell you a cd in three pieces.

And so the conversation went on, and the bloke got madder and madder. By this time he was nigh on shouting at my boss while a a couple of us were sniggering at the other end of the counter. Then came the grand finale:

Us: Sorry, we can't refund you for this.
Guy: LOOK, I'M A POLICEMAN, WE DON'T LIE!

At this point we basically laughed the guy out of the shop, I'm surprised the smoke alarm didn't go off from all the steam his ears were producing.
(Sureshot, Mon 29 Dec 2003, 13:14, Reply)