My father: I found something new today, was trying to clean up (something in a car) I couldn't get any traction, I ended up mixing together bleach and ammonia, it REALLY cleans well, but it's awful to breate in.

me: Dad, that's how they make chlorine gas, probably best not to use it.

My father: ohhh

edit: yesh chloromine, but it would have been lost on him