A week or two ago, we noticed spots on our kitchen ceiling. At last, we called in the plumber. The plumber came in and it seems that the leak is from a drain pipe and not a water line so we’re doing some diagnostics to find out whether it’s a toilet or sink.

But here’s the interesting part. When I got to work I talked to a couple of people about it, and found that this problem is more common than one would think. KA had a finish carpenter drive a nail through a hose in his tub. Others have had drywall screws driven into drain pipes. The screws rust away two years later and now you have a leak. I think this is what happened to us; our house is two years old.