I get it daily. People turn up and want a red DS, which are like trying to find Jesus right now, and expect us to have one, and then whine at me for not having one available. Frankly, if you come in and be nice to me, ill do whatever I can to help you get what you want, but if you come in and are a pain, my resopnse will be "no we dont have one, feel free to try x store", even though I can check other stores stock from where im stood.
Had a woman ring up a couple of weeks ago with a comment along the lines of
Me "Hi, how can I help"
Her "I bought mirrors edge last week and I just dont like it, can I return it for a refund"
Me "Erm no sorry miss, if its still sealed I can give you a refund, but since youve admitted to using it then theres nothing I can do"
Her "Well its not my fault your member of staff didnt know what it was about, and there was no blerb on the back"
Me "So you bought a £40 game that you knew nothing about and expected to be able to return it if you didnt like it?"
Her "Yes, its not my fault your member of staff couldnt tell me what it was about"
Me "Miss, we have over 5000 items in the store, do you really think we can possiblly be expected to know about everything we sell?"
Her "Yes"
I was in a bit of a bitchy mood myself, so the second she started on me she got it back