In Hamlet, Act II, Scene ii, Polonius announces to the king and queen that Hamlet is insane because of his love for Ophelia, who has spurned the prince's advances.
The king and queen are doubtful, whereupon Polonius proposes that the king and he hide behind an arras, in order to overhear a conversation between Hamlet and Ophelia.
As you're telling this, the line I keep thinking of comes from Hamlet, and you'll know it, it's very famous, Polonius to his son Laertes, this above all to thine own self be true.
And then on literally the next page, I guess this might be Poundcake, but she says, I'll quiz you on Polonius and maybe you can check out my Fortinbras.