Sam Winchester: So why are you here?
Crowley: Whenever there's a world-ending crisis at hand, I know where to place my bets. It's on you, you big, beautiful, lumbering piles of flannel.
Dean Winchester: Which means?
Crowley: After we put Lucifer back in his cage- together- I'll seal the gates of Hell. You'll never see another demon again, apart from, of course, yours truly.
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From: Supernatural