Revenge is dish best served...with laxatives and horse sh*t!

[inbredyokel]

Thought I’d try to attract input and/or stories of legal/illegal/semi-legal tales of revenge on colleagues or the establishment.
I was wondering if the lads on here have similar tales of horror/hilarity.
Basically have you or do you know anyone who taken revenge on an annoying colleague, in a particularly evil way?
Pulled this idea from a similar site....I’m not much in the way of original thinking, except for my controversial “Peace through porn, curry and drinking heavily planâ€