Not in a `I know they've been stealing stock` kind of way, but just as some perverse game. Like if you had a colleague or boss who was just a prick to you. Reckon you could get them fired, even if it meant losing your own job etc? Wind them up til they hit you, or send emails from their computer when they aren't around, or anything more clever?*
* I don't want to get any of my colleagues fired, they are all lovely. Prompted by someone complaining about work in another thread, I forget which.