http://www.telegraph.co.uk/news/uknews/crime/9845363/Disgruntled-employee-spends-three-years-destroying-work-computers-with-Cillit-Bang.html (http://www.telegraph.co.uk/news/uknews/crime/9845363/Disgruntled-employee-spends-three-years-destroying-work-computers-with-Cillit-Bang.html)
It would have cost them less to have given him the pay rise :)