Known unknowns and unknown knowns

ROY COHN. So send me my pills, with a get-well bouquet, PRONTO, or I’ll ring up CBS and sing Mike Wallace a song: (Sotto voce, with relish) the ballad of adorable Ollie North and his secret contra slush fund. (He holds the phone away from his ear; Martin is excited.) Oh you only think you know all I know. I don’t even know what all I know. Half the time I just make it up, and it still turns out to be true!

—Tony Kushner, Angels in America: Perestroika, Act 1 (“Spooj”) sc. 5