I did this a few years ago. Overtightened tank bolts...heard a pop. Dumb*#@ here decided to turn the water on anyway and check. Needless to say had some water to clean up.
Since, I was painting the whole house at the time, this bathroom became my staging area (small townhouse, no basement).
A couple months went by, and I went to replace the toilet when I did that bathroom. Decided that I would make sure there was no water in the tank, and lifted the tank lid. Remember this had sat for 2 months.
Come to find out my wife had put ammonia cakes in the toilet tanks. Lifted lid, inhaled a cloud of this, fell into hallway gagging. I was thinking to myself, "I'm going to die, and the last thing I ever did was have my head in a toilet."
I've heard this refered to as a "Housewife's Cocktail".