phrases.org.uk http://www.phrases.org.uk/meanings/mad-as-a-hatter.html Carter on 'The Phrase Finder' Mad as Hatters "As mad as a hatter" As mad as a hatter – Phrase origins one of the theories As mad as a hatter As mad as a hatter one of the theories mad as hatters "As mad as a hatter" as mad as a hatter As mad as a hatter - Phrase Finder www.phrases.org.uk... http://www.phrases.org.uk/meanings/mad-as-a-hatter.html http://www.phrases.org.uk/meanings/mad-as-a-hatter.html phrases.org.uk "mad as a hatter" http://www.phrases.org.uk/meanings/mad-as-a-hatter.html As mad as a hatter "As Mad As A Hatter - Origin and Meaning."