Zachariah: What, you thought you could actually kill Lucifer? You simpering wad of insecurity and self-loathing? No. You're just a human, Dean. And not much one of them.
Dean Winchester: What do you mean, I'm the sword?
Zachariah: Michael's weapon. Or, rather, his... receptacle.
Dean Winchester: I'm a vessel?
Zachariah: You're "the" vessel. Michael's vessel.
Dean Winchester: How? Why? Why me?
Zachariah: Because you're chosen! It's a great honor, Dean.
Dean Winchester: Oh, yeah. Yeah, life as an Angel condom. That's real fun!
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From: Supernatural