get a teacher to let you in early to another teachers class room and shrink wrap (its like saran wrap but 1000x as strong) EVERYTHING i did this in gr8 with the help of my gr7 teacher
another thing (requires a big snowfall) is shovell it to completely bury your teachers car. another thing is shrink wrap their car. (this is really amusing because the only way to get it off is to cut it which you cant do without scraping the paint unless you climb under the car and cut it from there
hmm what else.... oh yeah. if you ahve a teacher with a really small car like those smartcars...get a bunch of stong guys like the football team to pick it up and turn it sideways inbetween two cars...IT WILL FIT...trust me
i ahve another one but i dont know if the mods would appreciate it. involves making ppl think that there car blew up while theyre sitting in it. if they say its ok ill post it