Can't recall any really noteworthy pranks that I've pulled on others, but I remember my older brother getting me good with a gaming-related one.
So I was maybe twelve or thirteen. We were out in the driveway, and Ken and his buddy are about to leave with the car. He starts backing out of the driveway, when suddenly, there's this awful "crunching" noise. Ken stops the car, shouts, "What was that?!", and they both jump out. We all scramble to the back of the car to find an original model Game Boy, smashed and crushed into bits under the wheel. Ken goes, "Oh shit, that's right. I was borrowing your Game Boy, Ange, and I had placed it down for just a minute on the floor. I completely forgot about it."
After the initial shock sunk in for a few seconds, I think I was swelling up into what might have been one of the biggest fountain of tears I ever let shed. "My awesome portable gaming system, reduced to bits." -_-; And then the double-hurt revelation, "Oh no, my relatively new copy of Super Mario Land 2: 6 Golden Coins was in there, too!" >_<; Just before that happened, he and his friend scream, "April Fool's!!" and burst out laughing. Turns out the broken Game Boy was actually his friend's. It was pretty much beaten up and broken already, as he apparently took it apart a long time ago to see what makes it tick, so they used it as the bait for their cruel little joke.
Boy, was I upset. I've come to forgive him eventually, of course, and I can laugh back on it now; he did, after all, buy me a spiffy new Game Boy Color and a copy of Super Mario Bros. Deluxe years later as a means of forgiveness. But yeah, such an asshole. ;p