hatstand vs mad as a fish

hatstand

adj

  • Crazy, insane. 

noun

  • A device used to store hats upon, consisting of a vertical pole with a sturdy base to prevent toppling, and an array of pegs to hold the hats. 

mad as a fish

adj

  • Demented, crazy. 

How often have the words hatstand and mad as a fish occurred in a corpus of books? (source: Google Ngram Viewer )