My brother has been working on a way to make large explosions without the inherit danger of real explosives. Sawdust ignites well when mixed with the right ratio of air, so he devised this contraption. I hope to have an example of this at night- which is a truly spectacular effect! The intent of this is for special effects in a low-budget war film I'm scheming to start soon... err, someday.
Update: This video is featured in the MythBusters' "Viral Videos" episode, aired on Sept. 3, '08.
Panasonic HVX-200, 1080i, 60fps