Mad As a Hatter - A mad as a hatter is someone who is utterly nuts and not mak

A mad as a hatter is someone who is utterly nuts and not making any sense.

My sister is mad as a hatter and thinks the moon is made of cheese.

My friend is mad as a hatter and thinks the president is a giant robot.

My dog is mad as a hatter and thinks the mailman is a thief.