I love when I find a fun online game to play.  When the workday is going completely insane and I want to burn the place down (Milton in Office Space) it is helpful to immerse oneself in fantasy.  Treasure Of Cutlass Reef allows just such opportunity.  This is a cool game where you're a pirate ship who's goal is to plunder and destroy other vessels.  Plunder as much gold as you can in each level then between levels you can increase your ships armor, crew, weapons, speed, etc.

Here is the battle field.  I have found this game to be quite fun and addictive.