From http://www.youtube.com/watch?v=oA41x4pHBQY Ingredients: 6 Ping pong balls 1 Plastic straw 1 Sparkler 1 Needle or small thin metal object 1 Compact heat source Some tin or aluminium foil Step 1 Cut up five ping pong balls into tiny shards. Step 2 Cut a hole into the last ping pong ball and place all the shards in it. Step 3 Cut the plastics straw into three shorter segments. Step 4 Expand the hole in the ping pong ball so that it is just large enough to fit the straw segments in and put them in, this is the vent for the smoke to escape. Step 5 Heat the needle (or small thin metal object) and poke a hole in the ping pong ball, not too far from the straws.. Step 6 Place the sparkler in the hole, shorten or lengthen it as you see fit because it is the fuse. Step 7 Wrap everything up with foil leaving the straws and sparkler sticking out. Light the sparkler when you want to set off the smoke bomb, the smoke it white and toxic, be cautious.