There was a very LARGE sign on the printer 'DO NOT PUT YOUR CARDS ON THE PRINTER' and once a day, someone would put their cards on the printer, it would run out of paper, and automatically open up for more paper... scattering the cards to the wind. I would only spend one day punching a week, so as to avoid saying..."You have a printout... just start sorting by hand, and then put a red mark diagonally down the top... My father used cards too, and his decks became Christmas trees.
My dad told me you were supposed to make a diagonal line across your cards with a magic marker incase that happened so you could put them back together.
My first year in college was the first year they didn't use punched cards at my college.