Old_Zircon This is pretty much what PoEcon 1 & 2 were like, from what I can remember.
fluffy For a while, the annual assorted fireworks collection came with these little pull-string things where pulling it would make a little firecracker go off. One day my brother and I (who got tired of tying them to doors and trying to prank each other with them) figured out that they still worked underwater. So we took a bunch of them to a swimming pool. Oh, that was a fun day.