Say you're a manager who tends to be a little too "friendly" around women. There are two women in the company. It's easy to figure which one. Or things like the pantry is dirty and you're the one who's most vocal about it. Or you're sitting across from some guy who doesn't shower when he goes to work. Or maybe the back end engineers tend to screw up on a lot of little things, and you're one of the three people who deal with them. You could fingerprint someone with just a few of these.