I once had demigod access to Southampton University Computer Centre. The ops staff used to rip erroneous job cards in half and put them back in the deck for rep

I once had demigod access to Southampton University Computer Centre. The ops staff used to rip erroneous job cards in half and put them back in the deck for repunching. Clueless or lazy students sometimes repaired them with sellotape and resubmitted. The resulting bang as the card hit a high speed reader could be heard across the whole room and would take out the card reader for about 15 minutes while glue was cleaned off the innards. This time that user's whole job would be returned, guillotined in half and tipped into a manilla envelope, with a suggestion that next time they repunch error cards. Savvy users realised that you could repunch the correct code and use chad to fill in unwanted holes. Stacked in a deck these could last a surprisingly long time. (Yes, I'm that old.)