"As mad as a hatter" is a pretty fucked up phrase when you think about it
By - Evening-Raccoon7088
Yeah all that heavy metal poisoning from the mercury they used to set the shape dies tend to. . .make one a little mad.
Isn’t it because of [Erethism](https://en.wikipedia.org/wiki/Erethism?wprov=sfti1)?
It’s not. Hatters were exposed to mercury vapors and suffered from the neurological symptoms. They were remembered for showcasing why mercury is dangerous.
Wdym, the Chinese emperor's got eternal life from it?