Under the guise of being security conscious, our section had a informal "doughnut charter" whereby if you leave your computer unlocked and someone managed to send an email to the section (cc'ing you) shouting everyone doughnuts then you must comply with the "promise". I was referred to at the time as the "god of email" and everyone knew not to do it to me or I would retaliate. This is because it happened once before. In that case, I set up a secure hidden rule in the person's email so that if they received a doughnut email they would automatically send a doughnut email from them... this also meant it was possible to trigger it at any time. They quickly begged for it to be removed. From then on, no dared touch my unlocked computer. When we got a new boss he was informed of the charter and was repeatedly warned not to 'doughnut' me but one day he ignored the warnings. In his case I set up a rule so that if he sent any email, he also sent out a doughnut email as well. Over the next four days he sent sooo many doughnut emails... He went from happy, to frustrated, to angry and then simply desperate. No one dared tell him I was my doing... He eventually came out of his office and begged for it to stop... Seeing his desperation, I stopped it. He was very appreciative but never put two-and-two together (that his actions caused it). He didn't find out till three months later that I was the one who did it to him. That was the second and last time I was ever doughnut'd.