Terrifyingly in this case it was. I’d missed an important practical test owing to illness so I was put in a lab by myself to follow the instructions on the board. Unfortunately the teacher had made a mistake writing them down so I didn’t put enough suppresser in so I ended up with the equivalent of a half stick of TNT. It blew out all the windows, collapsed the dropped ceiling vaporised the desk and deafened me for the next two weeks. The only reason I wasn’t hurt was because it started fizzing alarmingly and I took cover behind the next desk.