Me and some friends used to do chlorine bombs and rockets, this is something everyone can do. All you need is a plastic coke bottle (must be coke or pepsi or some acid cola). Drink all the coke leaving only just a little bit on the bottom (about two "fingers" deep). Now, get some chlorine (don't use tablets, and don't use chlorine dust too thin, it must be kinda rocky), and with a funnel put about 4 or 5 spoons of it. Do it quickly! Now, close the bottle as fast as you can and throw it away: the chlorine will react with the coke and the gases inside will expand and burts the bottle up. If you want to make a rocket, it's a little bit trickier, as you must turn the bottle upside down without letting the coke get out.