Mad Hatter
The Hatter, popularly known as The Mad Hatter is a fictional character encountered at a tea party in Lewis Carroll's Alice's Adventures in Wonderland. He makes a cameo appearance in the sequel Through the Looking Glass as "Hatta", the imprisoned royal messenger. He has been portrayed on film by Edward Everett Horton, Martin Short, Ed Wynn and in a music video by Tom Petty.
The phrase "Mad as a Hatter" existed long before the character, and may derive from the harmful effects of chemicals, such as Mercury, formerly used in hat-making.
The "10/6" on the Hatter's hat is commonly believed to be the price of the hat, meaning ten Shillings Sixpence.
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