Easily one of the schnastiest parts of being a SysAdmin is dealing with other people's keyboards. I'm a fanatic about not touching keyboards and mice with greasy, sticky, or otherwise unwashed hands. Other people, however, are far less fastidious. People who might otherwise practice good grooming habits and reasonable personal hygiene have some of the worst keyboards, often covered with coffee, food, and grease. Yuck.
Yesterday I got a flat for the first time in a while. Kind of a bummer.