Barney: [in old man make-up] You there, what's your name?
Woman: Cindy.
Barney: Cindy. I knew it! You're the Cindy, the one that can change everything...or spell our inevitable doom. Now listen to me, Cindy. I am Barney Stinson. And I am on an urgent mission from the future.
Woman: The future?
Barney: The future! And I can prove it! In exactly four seconds, the woman at that booth is going to slap that man. [Clears throat loudly]
[Robin slaps Ted; woman is amazed]
Barney: 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.
Woman: What?
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!
Woman: What are you talking about?
Barney: I have no time to explain. I have to get back to the reality accelerator before the vortex closes. Only you can save us, Cindy. I must away!
[Barney returns a few minutes later, looking like himself]
Woman: Oh my God! You're-oh my God! Can I buy you a drink?
Barney: Well, I guess I have time for one drink, and forty-five minutes to an hour of some other activity. But after that I have to get back to, uh, a secret research project I'm working on.
Woman: Global warming?
Barney: My god. How did you know that?

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