Because the giant warning on the bottle in bright red print with a skull and cross bones isn't enough, hundreds of people are wheeled into emergency rooms every year after mixing a deadly combination of ammonia and bleach- a corrosive concoction that can cause the lungs to fill with liquid.
Household bleach is 5% sodium hypochlorite. Mix it with ammonia and mono- and di-chloramines are formed. These nasty fellows will cause lovely symptoms such as respiratory tract irritation, tearing, and nausea. To make things better, add water to get hydrochloric acid and nascent oxygen- also known as chlorine gas, the chemical weapon of choice of Nazi Germany in World War II- for the added bonus of drowning in your own fluids!
Should a person misguidedly join these two in a most unholy matrimony, they may feel fine for a short period of time until they notice white spots in their peripheral vision. (That would be the lack of oxygen to the brain.) Then they may feel woozy. They will be lucky if they make it out alive.
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