Would you like that round or square?

Once, a few years back, I went in to a radio shack to look for floppies (CD-RW drives were much more expensive then). The location of the diskettes was not immediately apparent, so help was sought from the clerk. When asked about floppies, she replied: 'Do you want the round ones of the square ones?'
The ignorance of this radio shack employee still baffles me. I mean, how could you work for radio shack and not know?