Butchering my design documents to make them look evil. I may have a job that requires self control but I can do whatever I want as long as it doesn't show up in the office.
Kind of childish to spend time designing an evil kill-droid, but I never grew out of the habit.
Those coffee Rockstar mixes.
I'm not a fan of energy drinks at all or heavily unhealthy things but coffee and me are like that after prom hotel fling that never ended.