I knew that would grab your attention. Whenever I turn my shower on a terrible noise occurs, accompanied by violent rattling. I either am dealing with demonic possession, a trapped banshee, or a plumbing related issue. My best laymen's guess makes the latter the likely option. Now, I have heard there are air reservoirs connected to the pluming, and if those reservoirs should be come depleted of air, then a racket may occur when turning on the water? Right now, if I turn the water on really fast, I can avoid most of the noise. If I turn the water on slowly, the noise and rattling are unnerving. This is a multi-apartment building. I hear at least one neighbor's pipes screaming. I believe all this started when our waterworks cut off the water for a few hours when they were replacing some major underground pipes a while ago. How do I get rid of the banshee, or how do I exorcise the pipe monster?