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Albertosaurus
Since: Jan, 2001
Tylendal
Since: Mar, 2011

I'm pretty sure this is a movie I've seen before, but I can't remember for sure (it may have been a television show).
The one scene I'm trying to place is at some kind of masquerade ball, where the hero (a man) goes up to a woman (who is an anti-villain of some sort, or they're just not on very good terms). They have some sort of conversation while engaging in some kind of choreographed dance which involves a lot of steps, turning and touching their hands against each other's. Even though they're wearing masks, they recognize each other. I think perhaps she tries to warn him about something the villain is up to.
I've looked at the page for Masquerade Ball and other lists of them, and nothing is jumping out at me.
Also: It was definitely not Eyes Wide Shut. I know that movie has a well-known scene at a masquerade, but I've never seen it in my life.