I can flex my tensor tympani muscle at will which causes an internal roaring sound to be heard in my ear. (This can be heard by anyone when one is yawning.) Apparently it's unusual to be able to do this at any time even when one is not yawning, but it's completely useless, as it's not loud enough to fully drown out annoying people.
Hey, I can do that too! I didn’t realize it was unusual to be able to do it.