You would play upon me; you would seem to know my stops; you would pluck out the heart of my mystery; you would sound me from my lowest note to the top of my compass.
– William Shakespeare
Hamlet, Act 3, Scene 2. Hamlet is disgusted at the hypocrisy of his friends Guildenstern and Rosencrantz, and accuses Guildenstern of playing him like a recorder, using him and trying to learn all his secrets.