I want more. I want to dance with you...

[butterfly]

Xander tells Buffy that he wants to dance with her in Prophecy Girl.

In When She Was Bad, Buffy uses a dance with Xander against him and Angel and Willow.

When Spike sees Buffy in School Hard, she's dancing with Xander and Willow.

Angel comes for a last dance at Buffy prom. (In, shockingly enough, The Prom)

Riley and Buffy 'fix' their relationship over a dance in Superstar.

Xander proves that he is himself with a dance in The Replacement.

In Fool for Love, Spike tells Buffy that they're dancing, that that's all they've ever done.

Of course, Once More, With Feeling has tons of dancing in it.

In Dead Things, she passes up dancing with her friends to have sex with Spike while watching those friends dance.

Dawn dances with RJ in Him to show her desirability.

Other notable dances or mentions of?