Well, half of my kitchen sink is missing, stolen by the maintenance man for my building. Why? Because half the pipes were filthy, rusted amalgamations of leaky steel. My sink leaked, badly. Running any water through it, via dishwasher, or just through the main drains, would result in water dumping all over the storage area underneath. Judging by the pipes he showed me, this has been happening for months, and the previous occupant never noticed.