Mike,
The best fun one an have is with dry-ice bombs. Just nip to Inflight catering for some dry ice. Start small and crush some up and stick it in a small coke bottle (plastic) then add some hot water (about 1/4 bottle) screw the lid on quickly and shout "Grenade!" the RUN. One hell of a bang with no dangerous shrapnel! Result!
We had to give up when we progressed to water jerry cans with four pack of dry ice in. The jerry can was placed in a para skip and dumped in the middle of the hangar. We watched it bloat until the most thunderous roar and deafing bang. JEEEEEESSSUUSSSS it was like an Artillery shell going off. They even heard it on the football pitch some 1/2 a mile away.
Tread wisely and have fun
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