At my old college we had a card reader that read the cards in, and ejected them out the side into a hopper. However, if you put a bend into the cards at about column 10, they would come flying out, miss the little metal tab that caught them and made them fall in the hopper, and continue flying to the side into the adjoining trash can
When I had to run a short "throwaway" job, it would amuse me to go up to the reader, insert my deck, turn and walk away as the cards flew into the trash, and do this when the next person in line was some grad student with a shoebox deck