chemically imbalanced vs one brick short of a full load

chemically imbalanced

adj

  • Mentally ill. 

  • Used other than figuratively or idiomatically: see chemically, imbalanced. 

one brick short of a full load

adj

  • Not mentally sound; insane. 

  • Stupid. 

How often have the words chemically imbalanced and one brick short of a full load occurred in a corpus of books? (source: Google Ngram Viewer )