Don't work in a game store but I work in retail and I've seen people similar to these.
"I'm here to buy a wireless." (Pause.) "Well, do you have any?"
I glance at the wall of Bluetooth, cellular, and wireless networking devices. "A wireless what?"
"I don't know, he told me to buy a wireless! Where are they?"
People who know better than company policy is a favorite of mine, much like driving nails into my genitals is a favorite of mine. My personal favorite was the guy who tried to return something with no packaging, missing parts, and no proof of purchase. Then he insisted we should return it anyway (full refund, natch) because I was the one who sold it to him so "I knew him". I reminded him that I was the one who told him NOT TO BUY IT because it didn't do what he was asking. And I still needed the receipt and the rest of the components. Got an interesting stream of profanity out of that one.
And then there was the old woman who basically accused me of molesting her grandkid. What I really did? I said there was no returns on anything physically damaged. The kid bought the wrong thing and broke it (PCI-E vidcard for an AGP computer, used tin snips or something to make it fit). He went running to grandma and made some seriously messed-up accusations.
