sorry guys but i used to be one of the horrible baskets playing joke's
when we'd get a new boy,used to make crisp packet bombs filled with act/oxy mix with a fuse (makes a hell of a bang). then send them to dinner,let i'm sit in the staff room all quiet for 10 min's,then burst in with a black bag inflated,with a fuse lit in the end (only filled with air ) and lock the door!!!! you could hear the screams for mile's.