Chem tip of the day: Never mix ammonia with bleach...produces lung searing gasses that can off you.
Did it 30 years ago at my first job Taco Bell. But the toilet cleaned itself while I was outside gasping for air. LOL
Had a girlfriend that did that, she also added powdered Ajax. Was trying to clean her bathtub with the stuff. Lucky me I walked in in time. In hindsight, I should have left and made the apartment airtight. That was like 20 years ago. :-)
Early in my grad school career, I was growing yeast in nitrogen-based synthetic medium. It's standard practice to bleach anything that has been used to grow microorganisms, so there I was, pouring bleach into my yeast cultures.
I got a pretty nasty headache (like someone was driving an awl through my eye), but I never again forgot that nitrogen salts are ammonium salts!