No one will
probably believe me, because this does not
sound probable, but I'm going to say this, anyway. When I was much younger, perhaps 23 years of age, the bones under the base of my tongue shattered for no apparent reason. I could feel these tiny bone fragments moving about, and the pain was tremendous, cutting me from within.
Soon, these bones had formed into a pile, so I elected to remove them myself, in order to avoid a trip to the E.R.