Did I mention that perhaps an employee was talking about a co-worker in customer service?
I went to exchange my PSP, as it had two dead pixels (No biggie), and one huge piece of dust in the screen (annoying as hell).
I went to exchange it, and the girl in customer service said, "You're exchanging your PSP, because of a single spec of dust?" She then rolled her eyes at me.
Then she brought a new PSP, and just put in my old box.
I asked her about the serial numbers, and a new receipt. If I had any future problems they probably wouldn't take the unit back if the serial number didn't match.
Jeez, just do your job and lose the attitude.