In 1518, a "dancing plague" struck Strasbourg, Alsace, whereby hundreds of people danced fervently in the streets over the period of a month. Some suffered heart attacks or strokes, and many others died from sheer exhaustion. It remains unexplained.
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In 1974, prankster Porky Bickar was so into April Fools, he flew hundreds of tires into a dormant volcano in Alaska and set them on fire - fooling the local populace and coast guard into thinking the volcano was active.
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In 1859, the largest known geomagnetic storm struck the Caribbean, causing an aurora and telegraphs could even operate without a power source.
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In Mohave County, Arizona, if someone is caught stealing soap, they must wash themselves with it until it has gone.
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In November 2013, a woman in Florida named Linda Ducharme married a ferris wheel.
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