One particularly irksome colleague in a job far far away played golf on his work PC on a regular basis.
Someone (who, me?) added a "golf.bat" and changed precedence so it ran before the golf.com or gold.exe, whichever it was.
The golf.bat said something like "you're playing games in work time, your hard disk will be deleted", then paused for a moment and ran chkdsk /f in silent mode.
Time from starting playing golf to punching the power button - about 2 seconds, perhaps less.
Biting the hand that feeds IT
