You know those weird "house noises" that are constantly humming in the background, but which you don't ever notice except for random, brief moments every few days or so?

My new place has got some freaky house noises. Like right now. It's so high pitched, it's up and down, but always high pitched. Kind of like cicadas from the future. It is coming from the sink area. I'm about to pour molten lead into my ear canals. I think I'm going insane.