dry ice bomb (idea)

One should note, however fun dry ice bombs may be, that their legality may vary depending on your state/country. Here in the sunny state of California, they are classified as destructive devices by the ATF, and as such, are crimes to:

• Have the materials to make (dry ice, water, and plastic bottles)
• To make
• To transport (Turns out this is the baddest crime of the group, arms trafficking (a felony!))
• To allow it to undergo explosive decompression. Kind of unavoidable, really, once you've made it; also, 'explosive decompression' is a good way to describe it to people so they won't get freaked out

Not that it's hard to get away with it or anything. Not that I'd know, or anything. Nope.

Anyway, read up to make sure you're not committing a big no-no in... wherever you come from.

See Section 12303-12313 of the ATF document found here: http://www.atf.gov/pub/fire-explo_pub/pdf/california.pdf