Ah, sweet October, which I generally devote to discussion of fancy dress and masquerade balls, weird cotillion figures, and similar frivolity!
I have two words to start off the month in the proper spirit:
headless quadrille
Specifically:
The first couple is Anne Boleyn and Louis XVI. They are facing Lady Jane Grey and Marino Faliero (a 14th century Venetian Doge). Marie Antoinette and Charles I make up the first side couple, facing the Earl of Essex, dancing alone.
In case anyone missed the connection, all of these people were beheaded.
Themed quadrilles from history or literature were very common at fancy dress balls in the nineteenth century, but this really has got to be the Best Theme Ever. I just about died laughing when I realized the joke.