i can bring back the Wile E Coyote award....
when i was in high school chemistry class we saw a film about gas mixtures and how dangerous they could be... static electricity will set off 2H+O... turning the lights on in a room will set off H+Cl.
that could be true if the temperature of the gas remains constant, but it doesn't... Hydrogen has a heat of combustion of 140MJ/kg and the resulting steam will be at a very high temperature and so it expands rapidly.... in other words, an explosion.