Here's a quick instructable (I'm keeping it only one page) along with the warnings of why you shouldn't do this....
Warning: Toxic, do not do this instructable (I think that sums it up, but feel free to add on :) )
1. The Works
/ Flash Cleaner
(or anything with sodium hydroxide
2. Aluminum Foil
3. Plastic Bottle with screw on cap
Do this outside away from people, animals, etc.
1. Place Aluminum Foil balls into the bottle.
2. Pour Cleaner into bottle (about 3/4 of the way)
3a. Shake it (optional) and run (not optional)
3b. Or you can throw it.
For better steps, follow this link (Site where I got the picture from): http://www.dubayou.com/?page_id=42
I think that just about says it all. Now you can say that you've seen this posted before (and this time it won't disappear)....
Video Credits: http://www.youtube.com/profile?user=iixmadxii
Also Please do not do as the video says to do.... I only chose that video to show the variations of the said bomb...