Easy - Fast - Cheap
1. Get something fragile, preferably a Christmas bulb.
2. Fill it up with AMMONIA.
3. Get something else fragile (if you use the Christmas bulb, use a test tube)
4. fill it up with HYDROCHLORIC ACID.
5. Place the (test tube) in the (bulb)
6.(optional) cover the test tube with plastic rap or cork it.
7. Throw it, when the chemicals mix it creates a large cloud of smoke.