I load up my fave game (Beat Hazard, available through Steam) and blast away on one of my fave MP3s. As short as 3 mins, or as long as 30. Obviously it won't fit the bill if you're using a work PC, but I code at home.
I'm not associated with the company, related to the developers, etc, etc. I just find it a very good time-waster for short amounts of time.