Just so you guys know...
liquid nitrogen works just as well for the bomb trick... 2L soda bottle, fill it about 2" deep in the bottom. We used to drop these into storm gratings around campus to scare the crap out of people, tying them to a large stone with a few feet of rope and throwing them into a lake makes a pretty awesome spout of water too, looks like a depth charge going off. You only have a few SECONDS before it goes off though with liquid nitrogen if you throw it into something containing water, if you just put it in a trashcan or similar it takes 7 to 12 minutes to go off. Both the dry ice and liquid nitrogen styles have enough force to easily break every bone in your hand and likely cut you deeply with the frozen shards of plastic, so you really shouldn't be messing around with this kind of stuff unless you know exactly what you're doing. Don't even think about doing this drunk and you should be 150% alert and fully rested.
if you hurt or kill yourself doing this, I'm not responsible, I will say "I told you so"
