I just heard a news report on the radio on the way home from work this morning. It has to qualify the person involved for a Darwin Award honourable mention.
A cleaner at a local resort caused an explosion that rocked the entire building when they mixed hydrochloric acid, caustic soda and chlorine. Miraculously, no-one was injured in the blast.
I would never consider mixing 2 of those chemicals together, let alone all 3. It kind of makes you wonder what the stain was that they were trying to remove.