Re: To err is human...
Funny that you mention punchcards: I recently pulled one of my old boxes of code stacks out of the cellar, to let my grand-daughters make the quintessential early-70s craft project: the Punchcard Christmas Wreath.
I had forgotten the joys of card stacks, and the multiple marker and highlighter lines across the top of the deck to help quickly restore the deck if you dropped it.
Good times, good times. . .