Watson, if it should ever strike you that I am getting a little overconfident in my powers, or giving less pains to a case than it deserves, kindly whisper ‘Norbury’, in my ear, and I shall be infinitely obliged to you.

(Sherlock Holmes till Dr Watson, lördagen den 7 april 1888 efter avslutandet av fallet med ”det gula ansiktet”.)