Bass does weird things. This spring, every night laying in bed I would hear this very quiet, very low frequency pulsing noise that would start in the evening and last until morning. It was annoying, I'd sometimes have difficulty getting asleep because of it, and several times I'd go on a late night hunting trip through the house looking for the cause of the problem, unplugging fridges, freezers, etc.. Go out in the back yard, can't hear anything. My wife couldn't hear it, but she often doesn't hear high or low pitch noises that I can hear. It got more annoying each day. I started sharpening my axe. Then early one morning I realized that I could hear it faintly outside when standing by the garage. So, I go for a walk through the neighborhood and find, a couple of blocks away, that they have a massive propane-fired construction heater blowing air into one of the giant estate homes going up. Standing 30 feet away from it, the pulsing noise was only slightly louder than in my bedroom 2 blocks away. As best I could figure it, the heater was creating some sort of low frequency standing wave that was causing my house to resonate.
Too bad about the fire that destroyed that house the following week.*
*Just kidding.