I have an uncle that used to torment the hell out of us when we were younger. We were all farm kids, so it was a lot of getting hogtied, or bumped with a hot shot if you werent paying attention while working cows. Around 7-8 I was finally fed up with not being able to retaliate and started working on a game plan. I was a runner at our auction and he was the auctioneer so one of my jobs was to make sure he had a cup of Pepsi to drink throughout the day. I had decided that each Saturday I would mix in some salt, pepper, mustard, etc from the concession. After the first couple of refills he relented and just started drinking it regardless of what I would put in it. The actual plan was ready to be carried out. I put a bunch of ice in a cup, filled it halfway with Pepsi and topped it off with a cup I had peed in earlier so as not to melt the ice. By that point he was so used to drinking contaminated Pepsi that he finished the whole thing without question. I was in college before I ever let him know what I had done. It was a great feeling knowing I had come up with such a long plan as a young kid and retaliated in a way that he never knew he had been had.