[Cthulhu_]

I went to the shops yesterday and forgot the PIN code for both my cards. I've been typing one of those in for nearly 20 years. ¯\_(ツ)_/¯

My mum frequently punches in her postal code instead.

[mkesper]

Try to remember the finger movements.

[sdeframond]

Works well until you encounter a new keypad layout (eg when going abroad). I locked my card once like this although I had been typing the code for years before.

[waterhouse]

Android has this "draw a path through some dots in a grid" analogue to a PIN code. On the boot screen, the grid is a somewhat different size than on the unlock screen. This defeated my muscle memory, and my conscious memory had lost its backup.