Lets presume there was an explosive gas in that bottle. Dumpsters and all the stuff in them make some nasty shrapnel.Except it would take a heck of a lot more than a couple of water bottles and a firecracker to turn a dumpster into shrapnel. When I was a kid, there was a dumpster at my high school in which someone set off some dynamite (at least that's what the rumor was). I saw the dumpster. The sized were bowed out but the dumpster was intact.Apologies to the "nothing to see here, just move along" crowd, but this sounds like harmless fooling around with fireworks that has been blown WAY out of proportion.
Depends on what is the water bottles. Two liters, or even a 1/2 liter, of Nitro would probably completely shred the dumpster, and maybe parts of the adjacent dorms and two liters of TATP would at least burst the dumpsters (which none the less are generally pretty sturdy). But there were 3 bottles involved in this case. Probably nothing that energetic though. The article linked at #20 said nothing about firecrackers, but only about "chemicals" in the bottles.
this sounds like harmless fooling around with fireworks that has been blown WAY out of proportion.
It may have been blown out of proportion, but I'd hardly call something that sends a guy to the hospital "harmless".