There were two employees, I walked in and I asked about a Ram upgrade for my laptop computer.
The older guy didn't find any that specifically was compatible with my laptop, but he did have slightly faster sticks that /might/ be compatible. So I asked to test the Ram in my laptop which I had with me, and the younger employee interrupted us to say "how am I supposed to sell this new if I let you test it?". His tone was a bit rude.
I tried to explain that a computer store will almost always allow Ram to be tested, or at least returned if it's incompatible, because the nature of Ram requires that. He didn't listen, and repeated "how am I supposed to sell this as new then?" I spent a total of two minutes in the store, and I will never return again. I'm a computer programmer, I know what I'm talking about, and they've lost potentially significant future business.
Summary: rude kid doesn't know about the technology he's selling, and offended an expert who just wanted a simple upgrade.