There was a jumping castle for a fundraising thing just before muck up day......There were a bunch of yr 7s in there, bouncing around happily, and I hurled a basketball in there with all my force from an elevated height. It hit a kid in the head, making the funniest "PONK" noise! Im horrible arent I?
Our school don't have muck up days anymore, because some chick tried to climb up our bell tower and fell off and broke her spine.
They were excellent - I remember one year soembody stole the pizza hut sign and stuck it on the roof of the school hall because it's the same shape.
This year they just did stupid things like honey and glad-wrap on toilet seats