I had some trauma induced hearing loss recently and cannot hear certain frequencies at all with my left ear. When I stand outside next to the (small) waterfall with it on my left size, I can hear "part" of it from my left ear... and the other part as if it was coming from the woods on the right side. It passes right by my left ear w/o me hearing it, bounces off the woods, and comes back to me. It sounds like there's 2 different waterfalls, one on each side of me.
Trippy, isn't it? A similar phenomenon can occur without hearing damage, where the reflection to the right ear is at the right phase to cause wave-interference with the source waveform that reaches the right ear.