I once heard one of the guys from Cray give a presentation where he told a story about playing a prank on one of the Army research guys. He said it was right after they had installed a shiny new (washing machine sized) hard drive. They had already duplicated his (many thousands of punch cards long) program onto the drive.<p>They had a glass room overlooking the actual computer room where you&#x27;d go after handing one of the techs your cards to be entered. They brought the guy up there and he was waiting after handing off his cards and they had pre-arranged with the technician to trip and dump the cards everywhere. He said the Army guy turned white as a sheet of paper and looked like he was going to cry (this would have necessitated many hours putting the cards back in order). Then he told the guy that it was fine and they already had a copy loaded in on the drive.