Who said "We're all mad here."?

This quote is attributed to The Cheshire Cat.

We're all mad here. - The Cheshire Cat

"We're all mad here."

The Cheshire Cat Humor

Character in Through the Looking-Glass

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"If you don't know where you are going, any road will get you there."

"We're all mad here."

"We're all mad here"

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."