"heirloom." My grandfather got back in dental school back in the WWI era. It got passed around and went to a few show and tells along the way.
When my grandfather passed away, my mother and sister went to Oklahoma for the funeral. Some people came by to pay their condolences. While they were visiting in the living room, it was either my sister or my cousin that walked through the living room with the skull. Noting the startled expressions, my grandmother just made the comment, "Oh that is just Poppo's skull." From what my mother stated years later, you should have seen the visitors' expressions at that point. 
They had to explain that it was not really my grandfather's skull but one he got in dental school.
Last I knew my cousin had it, I don't know if he still does.
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