mad as a hatter 疯狂；疯疯癫癫

【例句】
She walked out of the room, as mad as a hatter.
她疯疯癲癲地离开房间。

He wants to build a plastic car and drive around the world! Talk about being2 as mad as a hatter!
他想建造一辆塑料车，开着它环游世界！他真够疯狂的。