Used to work at a casino as security and while recording employees with coin to fill the machines, we had to sign our name and employee number on literally hundreds of slips per day.
I have signed my employee number on rent checks and even some Christmas and birthday cards without even realizing it.
We also had to clear our hands by showing front and back of hands to the surveillance camera.
I've unthinkingly cleared my hands on many occasions while shopping and putting something back on the shelf.
It took me literally years to break those habits and I still occasionally fight to not sign my employee number.
"The stone cannot know why the chisel cleaves it. The iron cannot know why the fire scorches it. When thy life is cleft and scorched; when death and sadness leap at thee, beat not thy breast and curse thy evil fate. But thank The Builder for the trials which shape thee."
From Thief: The Dark Project