Ahmad was enemies with Mustafa and Husain, and so Ahmed decided that he must poison both of them. He went and got two humidifier which released slow acting poisons in the air.
Once he got them, he installed them in his own house, in a position such that they could be seen from the window. He also put two placards around them stating in big bold letters "FOR MUSTAFA", and "FOR HUSAIN" respectively.
Seeing this, Mustafa got offended, and went and got his own poisonous humidifier and installed it in his own house, with a placard around it saying "FOR AHMAD".
Husain, on seeing the humidifier in Ahmad's house, burst out laughing. Of course this made Ahmad even more mad, so he bought one more poisonous humidifier and installed it in his own house with another placard: "FOR HUSAIN".
And Ahmad and Mustafa and all their guests and friends and family, slowly got poisoned.
You think thats funny? Where do you keep your hate, rage and resentment?
ETA: "and resentment" and the Subject.