My productivity is vastly improved when I have an arch-nemesis.  Someone to whom I can dedicate heroic feets of self-less activity merely to prevent them from one upping me.  Upon returning to work, I discovered my old one had moved on to another job and have thus sat around near catatonic for a week.  That was until today a woman when a woman gave me a dirty look for taking her Lean Cuisine out of the microwave after she failed to remove it after 5 minutes.  The game is on Ms. Dirty-Look-Giver-to-Microwave-Dish-Remover-People, the game is on.