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Barney [dressed in old man costume]: In a few minutes, the young me from your time is going to come through that door. Now, Cindy, I know this sounds insane, but in order to save the planet, you need to sleep with him tonight.
Cindy: What? I...
Barney: Sleep with Barney Stinson tonight, in whatever way he wants it, or he won't be able to find the solution to global warming that saves the human race