There is two meaning to "rarity":

First, that's one of my rare post in looooooong time!

Second, what is about to be post is definitely one of rare, unique thing :)

While nosing around on Ebay, I came across most strange item ever to be sold.

*drum rolling, bass clanging, bell rings, ok, enough of this*

Human Tooth Ring!!!!

Heres is the link...help your self to goggling at it while it is still there for sale:
Human Tooth Ring