Derived from the question regarding the identity of the person within Sixth Edo Tensei Coffin summoned by Kabuto Yakushi in the Naruto Manga, which appeared to gain a significant reaction from the normally unshakable Madara Uchiha, which has started a rampant stream of theories and suggestions for the interest of speculation.
Can be seen and referred to also as a plot device where the appearance of any unseen/unknown character whom holds some key significance to the story, by causing a shocked or emotional reaction/outburst in an important/major character.
Abridged Version of Conversation
Madara: You want to join forces with me?
(Kabuto summons five coffins with Edo Tensei, which are the deceased Akatsuki members)
Madara: What do you want in return?
Kabuto: Uchiha Sasuke.
Madara: What if I say no?
(Appears Kabuto's Sixth Coffin)
Madara: Th-That's...! You madman! How did you do this?!
Kabuto: Oh you know... Anyway, you can relax. I haven't told a soul.
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(n.) Activity that contributes to an early death
The decision to take up smoking is another nail in the coffin.
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The after hours, alter ego, of any "Coffee Time" donut shop. This transformation occurs, when the local Gothic bar or nightclub closes its doors for the evening, and the vampire people congregate there. It being the only place still open, at that hour of night.
"Welcome to Coffin Time...Would you like a side order of blood with your donut, FREAK?"
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Throwing someone onto a parked car and busting the windshield
Thugs find innocent bystanders and enjoy putting them in the coffin and unsuspecting shoppers return to the vehicle they left in the parking lot to find a busted windshield.
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Southern slang for shut your mouth.
You better close your coffin before I close it for you.
Hey, I'll be right back, gonna go outside and put a nail in my coffin.
An act involving a protracted creaking noise, accompanied by an ungodly stench.
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