A Fight Is About To Breakout
During lunchtime at school, gather up a large group of trouble makers. Then walk around campus with pissed off looks and pumping fists. Make it look like you are about to go to war and start a huge fight. Be sure to walk passed your campus security and vise principal or whoever else is monitoring the campus during lunchtime. Not only will you get other students following you guys wondering where the fight is gonna take place, but the school staff will follow and monitor the situation as well. In my high school, a group of latinos with shaved heads would do this once a month. They would end the parade at the handball courts and then bust up laughing when they got there. It was hilarious!!

Classic Locker Jam
Shove your victim in his locker and lock it.

Star Wars Prank
Tell your victim that you have the force. If he says prove it, then lick your hand and push his face to send him backwards.

Towel Snapping
Towards the end of gym class after everyone has showered, wet your towel alittle, twirl it up a bit and begin snapping it at your victim. Works best if you have a group of students that can gang up on your victim from all angles.

The Wet Willy
Lick your finger. Be sure to get it really slobbery. Then unexpeditly put it in your victims ear.

Pencil Launching
Place your pencil along the edge of your desk so half is over the edge and the other half is on your desk. Then quickly chop at the half over the edge with your hand. Your pencil will launch in the air and fly clear across the room landing in enexpected places such as other students desks, students head, or in the class aquarium.

Your Exact Weight
Grab a pen and a piece of paper and go up to your victim. Then tell him or her, "If I write your exact weight on this paper, then you have to give me $20". Your victim will assume there is no chance you can guess their weight exaclty, even if you did they would likely think they can tell you another weight a few pounds away. But you don't have to write down their weight, all you have to write down is "your exact weight" as mentioned earlier. This way you did what you said and you win $20.