Yeah, there is zero tolerance for pranks any more. Our graduating class put live goldfish in them big fruit punch dispensers in the cafeteria.
I think they’d have you committed now for endangering fish or some nonsense.
The best stunt I ever pulled is this. The five minute bell for class rang. I lit a cigarette and poked a hole by the filter and put a firecracker fuse in it. I then placed it under the classroom window. Four to five minutes later it went off. It drove the teachers nuts because they could not see who did it.