This word belongs in the best ever category. It sounds like a party!
Doppelganger
Thanks to Ned for dropping it in the comment!
From Websters:
Full Definition of DOPPELGÄNGER
1: a ghostly counterpart of a living person
2
From Etymology Dictionary:
1830, from German Doppelgänger, literally “double-goer,” originally with a ghostly sense.
This is a great site, combines many definition sites to one. Love it! Memidex
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I don’t get the opportunity to use the word and honestly I wouldn’t think to but when someone drops it, I instantly smile and say “That’s A Great Word!”
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P.S. WordPress I wish you made modifying font size, style and true line spacing available in Visual mode without having to hunt codes down. I just won’t so my blog is boring.
Life Notes 
One of my favorite strange albums — Daniel Amos, Doppelganger. Creepy cover.