There once was a ma who was a waspologist (i.e. he studied wasps). For one of his projects he needed to analyse the sound made by European wasps. So he went to a specialist insect shop and picked up a cassette recording of wasp calls. He took the tape home, and when listening to it was confused as he did not recognize these calls, they sounded very odd, and unlike anything he had every studied before. So naturally he took the cassette back and demanded a refund. However the sales assistant was quick to tell him that he must have been listening to the B-side.