many years ago....there was a regional warehouse for lawn boy in the area where i was living.....there was a fire that spread to the building where the lawn boy parts were stored
iirc, at that time, there was a product recall on various push style mowers that used Mg decks....so there were a LOT of these mg parts in the warehouse
they caught fire and, of course, the local yokle FD didnt know to not use water on them and/or didnt really know what was burning
they started by spraying down the roof of the building...which held a lot of the water....the roof colapsed and dumped a big slug of water on the fire and BOOM
the cloud of smoke was HUGE and visible for miles
it was a miracle that nobody was badly injured or killed as it totally flattened that whole corner of the industrilal park where the fire was