Well something like this has already happened me to me earlier this year. I went to use my toilet in the master bathroom and I noticed that water was dripping out of the fire alarm heat sensor unit which is above my toilet. It was after 10pm on a Mon. night so I called our emergency number but only got an answering machine so I left a message.
I went upstairs to talk to the people living above me and later I heard a bunch of noise and water was dripping out even faster now. The man upstairs decided to move his full toilet into the shower for the night.:mad: This caused all of the toilet water to then leak into my bathroom below. It also set off our fire alarm.
I learned that he rents from his sister who owns the unit and she doesn't even have home owners insurance. I also learned that he had noticed something leaking earlier that day and he called his sister but she never did anything about it. I cleaned up the mess and waited a good 2 weeks to see if my ceiling would dry out on it's own. It didn't.
I then had to wait several more weeks for it to be finally fixed because the owner wanted to use our maintenance man and he was still on vacation. Luckily there weren't any mold issues to worry about. So this year hasn't been a good year for me or my condo.
Thanks again for all of the nice replies. I hope that I'll never have to go through anything like this again.:)