Some propane filling the space. that is impressive.
Anyone see the Mythbusters segment where they were able to do a catastrophic failure of a hot water heater? One of the coolest things I have ever seen on TV.
I remember a whole town in mexico going up. It seems that gasoline got into the sewage system. When it blows up it takes the path of least resistance.
About 30 years ago, an untethered water heater took off like a rocket through the roof of a condo, across the street and came down through the roof of a casita (unoccupied at the time) at the La Quinta Resort Hotel.