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I work at a machine shop and we had a shop vac that was full of debris plus aluminum shavings. Then the janitor took it and sucked out a toilet that will filled with muriatic acid to unclog it. The acid and alum reacts to for hydrogen gas which exploded from the motor sparks. The top blew off the vac hitting the janitor in the chest pretty good but didn't injure him. Scared him good though.