heh, as an adult a fascination with airsoft led to some interesting things. We (myself and a co-worker) built courses, complete with bunkers and ditches, but we decided we wanted a war zone. So we set out to create a massive smoke bomb. We decide to go with a potassium nitrate/sugar formula. After several attempts, we could only get stuff that would burn far to explosively to light in the woods, or wouldn't sustain a burn. We ended up abandoning the smoke bomb mission, but had a large amount of KNO3 left over, so we discussed it with the other engineers at work. We made homemade fireworks with a bunch of it. Another engineer was interested in the rocket part of it, and brought a bunch home and taught his son how to build rockets with it. They really ran with it and have been improving their rocket design ever since. His son, 15, won a local science fair with it and is now headed down to state. Gives me the warm fuzzies to think our fiddling with an airsoft smoke bomb eventually influenced a kid to win a science fair. Only drawback is that when someone sees you [url=http://twitter.com/BobaGotsJets/status/289117527701848064/photo/1]weighing piles of white powder on digital scales[/url], and carefully cooking them together, they think you are making meth.