Actually, there is some truth to it. When I was a teenager, some debris got in one ear, from swimming/surfing in the ocean. It slowly reduced my hearing in that ear. My overall hearing was okay, but I did favor one ear over the other for phone conversations. Then sometime later, was at the doctor for something else, and a routine check of my ear, discovered the partial blockage. The doc flushed out my ear, and I had “super” hearing, everything was amplified in that one ear. My body had made adjustments to compensate. After about a week, that one ear returned to normal.