The seniors had been planing for some time before April 1. The original prank consisted of getting as many seniors as possible to drive to school. They would then park sideways to take up all of the spaces. As soon as the bell rings for first period, the seniors would then go out to the parking lot and drive home. This was all intended to cause a good size traffic jam. However, the group wasn't very organized, so the decided to line up and block the bus loop. One of the bus drivers wasn't paying attention, and almost ran over several of the seniors!

The leader, a dude named Grant, had a bullhorn, and was trying to reorganize the group, when Mr. Evans tell him that he isn't authorized to use a bullhorn.?

The told him to turn it off, but he didn't know how, and just put it on the ground. They took Grant to the office to suspend him, and the other seniors followed him chanting "Free Grant." This got several of them suspended as well. Meanwhile a girl named Mary, after passing thru an intersection a short distance from school, stops her firebird in the right lane and leaves it there, and goes to school. (to stop traffic) Police came and put out flare, and were directiong everyone around the parked car, when some idiot wasn't paying attention while making a right-hand turn, and hit Mary's car. Noone was hurt but she has to pay damages to their car, and she got suspended because of it.

(I have no clue how, she wasn't on school property.)
That's pretty much it, anyone else can talk about April 1 pranks here if they want.