Neurological damage caused by mercury used in the curing process of felt was one of these reasons hat makers were known as "Mad Hatters" in the 19th century.
... Sorry if I've ruined Alice in Wonderland for anybody now. :/
Missed a few at the bottom. As the Queen of Hearts would say, "off with their heads!"
Queen of Hearts and Mad Hatter a year before the movie
I love this subtle nod to Alice in Wonderland that isn't too cartoony.