Marshall: Another guest? Who could this be? Why, it's Lily! And she's here to deliver one of your requests!
Barney: Oh, thank you, Marshall.
Lily: Oh, not that one.
[flashback to ten months earlier:]
Barney: An appearance by my all-time idol, the Karate Kid!
Future Ted: [v.o.] The Karate Kid was an uplifting '80s classic about a teen, played by Ralph Macchio, who defeats the local jerk, played by William Zabka. At least, that's how most people saw it.
Lily: Here he is, just as hot as when his Tiger Beat photo spread gave a young girl the courage to explore the suddenly unfamiliar topography of her changing body... the Karate Kid!
Ralph Macchio: Hey, Barney. It's Ralph. Listen, it's always flattering...
Barney: No! I hate Ralph Macchio! I hate him, hate him, hate him! He is not the Karate Kid! The Karate Kid was William Zabka, star pupil of the Cobra Kai Dojo, who this monster defeated with a cheap, illegal head-kick in the most tragically haunting film ending of all time.
Ralph Macchio: Oh, see, I thought you meant fun-crazy.
Barney: Shut it, Ralph Macchio. Why don't you go have a party with Luke Skywalker and Harry Potter and War Horse and all the other movie bad guys and stop ruining mine!