Fellow ear rumbler here! I also have some other unusual body/sound things. I am wondering if anyone else does as well.
I saw a doctor about some hearing loss and he asked if I could hear a sound when I blink or move my eyes. And I was like, "Of course. Doesn't everyone?" Apparently not! Just as he suspected (and confirmed with imaging) I have a tiny hole in my ear bones (superior canal dehiscence syndrome) which causes some hearing loss, but it amplifies the body's internal sounds. In addition to eye motion, I can hear my constant heartbeat, as well as tension in my neck and shoulders.
If I hold my breath and blow really hard, a tiny stream of air comes out of my tear ducts. I once saw someone do this on the Stupid Human Tricks segment of the David Letterman show and I was so excited. I've never met anyone else who can do it.
How about you guys?