The Mad Hatter in Alice’s Adventures in Wonderland wears, as we all know, a top hat.
On that top hat is a price ticket that bears the words "in this style 10/6", meaning that the hat, if ordered, would cost 10 shillings and sixpence. In America, 10/6 means it's the sixth of October - and that is why today is Mad Hatter Day, a day for general silliness and definitely a day to drink an Alice in Wonderland cocktail.
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