I'm not saying that I have done any of this or that you should do any of this.
The following are things that I would do IF there was no system of laws, and since we have a system of laws which prosecute people who do these things or even talk about doing these things I reccomend AGAINST doing them.
buy 2 or 3 dozen eggs
let the eggs sit in the sun for 2-3 weeks (this makes it look like its not you too, because there is some time between the incidents)
follow the target home
wait until 2 or 3 in the morning and egg his front yard (if you egg cars with rotten eggs, it will PERMANENTLY affect the paint THINK before you ACT)
or
put superglue into his locker lock or all around the combination thingy (dont get caught)
superglue into his parents car door locks
basically superglue is cool
gorilla glue works better for keyhole locks because it expands as it dries
or
make a fake pamphlet that accuses him of raping some chick from another school and distribute it without getting caught (best to find other people who don't know you to distribute them for you, bums work really well, especially if you need them to tresspass, say at 3 or 4 in the morning and get the pamphlets into piles around the school - if you use bums, be prepared to buy them cheap vodka)
or
photoshop pictures of the person in gay sex, host it on a fake name from inside an internet cafe that you dont have to register for with valid ID, and distribute it by writing the url in bathroom stalls
bathroom stalls are an effective means of distribution for various other operations as well
you should always use an internet cafe under a fake name to upload and host illegal or slanderous content
or
find a weed dealer whos plants were fertilized
obtain a large amount of pot seedlings
scatter seeds onto his property
or
research and contact various religious organizations which are rude and pushy and give his name and address to all of them and tell them that this is your friend and how you pray for him to see the light (of that particular organization). Likely as not, they will sometimes even set up special trips to go visit the person. this works especially well with jehovas witnesses and mormans