[lazysheepherd]

Indeed! It is like entering a pincode on a keypad for the office door every single day. Then the new guy calls and asks you about the pin, and you have NO idea. This happened to me and I had to put my hand on something flat and see myself typing.

I suspect this is some part due to the arrangement of the numbers. Numbers on keypads in these kind of devices often has "1 2 3" on the top row. Whereas on the keybaords and calculators it is reverse. The top row there goes "7 8 9".

[lathiat]

In the early days of card payment terminals my mum couldn't remember her PIN number to pay at a shop. Had to run over to an ATM and do a pretend transaction and take note of what she entered.

[datameta]

I'm like that with my phone lock pin. I use it visuospacially rather than numerically.