mad as a hatter

Not able to think right; crazy.

Anyone who thinks the moon is made of green cheese is mad as a hatter.

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Source: A Dictionary of American Idioms

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See as well

[hare] See: [MAD AS A HATTER] or [MAD AS A MARCH HARE], [RUN WITH THE HARE AND HUNT (RIDE) WITH THE HOUNDS]. A Dictionary of American Idioms

[March] See: [MAD AS A HATTER] or [MAD AS A MARCH HARE]. A Dictionary of American Idioms

[mad as a March hare] See: [MAD AS A HATTER]. A Dictionary of American Idioms

[hatter] See: [MAD AS A HATTER]. A Dictionary of American Idioms

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