Decades ago, tech-savvy people used to make fun of office workers who would put their passwords on Post-It notes stuck to their computers.
Considering that the world has changed and the vast majority of password security issues today come in through the network, and not the front door, it's amusing to think that pen-and-paper is probably one of the better options these days. After all, if the bad guys have physical access to the computer, there's pretty much nothing you can do to stop them, anyway.