This is a hoot! I gave up trying to blow up the toilets, however I did have access to M-80's. My friend's dad(who was a teacher at the time, ended up as principal at a local hs years later)showed me how to make a delayed fuse from a cigarette. I'd go into the bathroom in hs and light up a smoke, then poke a hole somewhere in the middle of the cigarette and insert the fuse. Wash my hands and casually walk away. Sit in class and try not to smile as the noise from the explosion rocketed down the hall :) Ahhh, memories...