The super has been here to see the mess and tackled the neighbor upstairs, who's clearly been having problems with his loose toilet and doing nothing about it. In fact, while the super was here, there was water dripping from the ceiling. So, I guess a plumber will be visiting my neighbor in the near future, and I will get a ceiling repair wihen all the wet plaster dries out. Of course, the big question is, how soon will the plumber make a visit?