I've thought about meticulously destroying my friend's social life by sending emails containing live decapitation and handicapped children in suggestive poses, then sending emails to the FBI about where a murder is, plant a bomb there (landmine or something), then while that's on the news and the kid is being convicted and all of my classmates are distracted, plant bombs in backpacks that are spread around the school, as well as one in the janitoroial closet connected to the natural gas pipelines, absolutely destroying the school, and killing me and 300 other people in a mass bombing. You could maybe fill up your backpack with 5-10 pounds of nitroglycerin, maybe more, claim it's textbooks and leave the backpack somewhere that won't be found. That, or planting pipe-bombs following the gas lines. Don't have the balls to do it, never will. Schools are really weak on security as well, and you could probably also get away with planting 5 lb of "salt" in a janitorial closet, when the time comes, piezo electric lighter and bam, it's gone.
I'm going to find a tracker on the underside of one of our cars, just wait for it.