Customer is looking directly at the TV remote they are holding in their own hand. The remote has a red button the size of an adult's thumbnail with the word "power" written on it in white ink. They ask me "where is the power button on this remote?". It was all I could do not to laugh in their face.
A customer comes to the counter with a brand new, still in it's vacu-formed plastic package, PS3 controller and asks "Does this controller work?". I couldn't help myself. Before I stopped to consider how patronizing or rude it might sound, I blurted out "Probably. What? Do you think we open them all up and test them, then box them back up again?"
I've got loads of them, but here's one more. A customer came up to me the other day and asked this one. Picture this: At our store, you walk though the front door and have to pass all of the games and consoles which are in areas clearly marked out by signs that are bigger than your typical street sign that say what system they are for(not to mention that the system the game is for is printed right on the box of each game) to get to the counter in the back. She passes all of that, comes to the counter and asks me "Do you guys sell games for the Playstation 2?" She had to walk around a display of PS2 games on sale to ask me this! I so wanted to tell her "Nope, don't have ANY PS2 games here, you might try Game Stop". Just to see if she'd say "thanks" and leave. But, I thought better of it and walked her right back to the great big PS2 section she had just walked through.
Later, I turned to my supervisor and said "Gee, maybe we need bigger signs. Maybe even ones with flashing lights." He just shook his head and laughed.