as mad as a hatter
瘋瘋癲癲的，瘋狂的
口語·形容瘋狂或古怪
英文釋義
to be crazy or insane
例句
He's as mad as a hatter, talking to himself and wearing mismatched shoes.
典故來源
源自19世紀制帽業，制帽工人長期接觸水銀導致神經受損，行為怪異，后比喻瘋狂。