Young man in the image of the Crazy Hatter from "Alice's Adventures in Wonderland"
The Mad Hatter is a fictional character in Lewis Carroll's "Alice's Adventures in Wonderland". "Mad as a hatter" is a colloquial phrase to refer to a sane person. It goes back to mercury-poisoned employees of hat factories in past England.
Being silly; being mad; wearing a mad hat; searching for insane things or habits during ones daily life
Silly People and Mad Hatter
A group of computer people
There is a little note on the Mad Hatter hat saying "10/6".