Because I'm a little bit late...
The boy and I went 1920's this year. He went as a mobster, and I was a flapper:

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Here's a picture of my costume:

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What was in that cup? Most likely cranberry juice. I was the designated driver that night, which was a REALLY GOOD IDEA because I ended up getting pulled over for accidentally speeding, and the cops gave me a buncha tests and a breathalyzer to see if I was intoxicated [which I wasn't]. They ended up letting me off with a warning. Whoo for being awesome!