A simple situation... my mom's MacBook Pro power adapter got all chewed up by the back of her LCD being opened and closed on it constantly. She took it to the Apple Store in Oakbrook, IL, showed it to "Patrick" and said she needed a new one. So he grabbed a box off the shelf and rang her up. As he rang her up she casually mentioned that I had applied to the store twice in two years and never even got a call, and he explained it was because you have to be very intelligent to work at an Apple Store. She drives all the way home and it turns out he sold her a battery, not a power adapter (which she physically showed him). Not only did he sell her the wrong thing, but it wasn't even the right battery for her particular MacBook. So much for intelligence.