"When I am out and about in my clinics, I like to look under the keyboard and the mouse pad; you would be surprised how often I find passwords there. So at least we are not leaving them out in the open on the monitors."
Rumor is that some months ago there was a person on my contract terminated.
Diplomatic Security conducts regular random security sweeps through our office spaces. Word is that this individual was caught 3 times in a row with passwords on post it notes around the desk. First two times were violation warnings, third time was an security incident (far more serious), and that's when he/she was removed from the contract.
True or not I'm not 100% sure, but I know I've found the occasional post it note with password on computers I'm using. When I do find them, I take it and tear it up and throw it out.