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Andrew wants to see Revenge of the Sith in theaters, so Dawn agrees to go. He squeals whenever Obi-Wan walks onscreen, and the people behind them pelt him with popcorn. They walk out of the theater pretending to wield lightsabers and force-choke each other.
Later, Buffy (politely) asks how Dawn puts up with that much concentrated dorkiness in her not-boyfriend. Dawn's tempted to point out that Buffy's actual boyfriend knows every song in The Nightmare Before Christmas, but she's not sure Buffy actually knows that, and Spike might consider that a secret.
Dawn's not complaining. Dorky fun is still fun.