I'm sure many of us from time to time have been in a large well known PC retailler and purposely asked questions to either confuse or wind up the sales people.
My favourite was in 2003 or so to do with Graphics Cards.
I asked him why an AGP 2x card would not fit in a more modern motherboard, also saying that there seems to be a bit in the slot in a different place to the card.
Rather than give me an answer about the signalling voltage (or anything remotely relevant) the sales assistant gave me this reply along the lines of "if you think how many of these cards are made, taking that little chunk out helps them save plastic to make more"
Anyone else have some good examples?