# mad as a hatter

> colloquial English phrase suggesting that a person is insane

**Wikidata**: [Q17146144](https://www.wikidata.org/wiki/Q17146144)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Mad_as_a_hatter)  
**Source**: https://4ort.xyz/entity/mad-as-a-hatter