In an era when food was a luxury for most Americans, dance marathons could mean the difference between a decent meal or going to bed hungry.

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There’s a great scene early in the Christmastime classic It’s a Wonderful Life, where our protagonist, George Bailey, crashes a dance at his former high school.
A great time is had by all
His future wife, Mary Hatch, encourages him to join fun and some jealous pranksters, eager to catch Mary’s eye and put ol’ stuffy George in his place, open the pool under the gym floor.
Clueless, George dances his way into the water, bringing Mary with him, as they all continue to dance and splash around. A great time is had by all.