EVERY TIME I PAY IN A CHEQUE IN OUR LOCAL BANK I go and leave my card in the machine...
Well I've done it twice, anyway.
It's because I get all stressed about putting the correct printout in the little envelope with the cheque and keeping the almost identical second printout that is your receipt, and so I forget to take my card back.
Still, the cashier had quite a deck of forgotten cards. She said I am not the only one who does it, not by far !