I used to turn my friends cigarettes upside down in the pack. It worked because he would just put the pack to his mouth and pull a cigarette out with his lips and then light it straight away. So he would end up lighting the filter on his cigarette. Coughing wildly and then tell me to go frick myself.

Sometimes he would make the mistake multiple times in one night.

My neighbor's dog poops in our yard all of the time. It wouldn't be a big deal, except he never cleans up after her. I finally had enough, so I decided to go with a classic. I put a flaming bag of his dog's poo on his porch, rang the bell, and hid in the bushes. When he answered the door, I finally got my revenge by having an affair with his wife for the last three and a half years.