Blanche: (comes out from behind curtains I forgive you.
Dorothy: Honey, where did you come from?
Blanche: Oh, I was hidin' behind the drapes.
Dorothy: What is this, Hamlet?
This is an allusion to the character Polonius in Shakespeare's, Hamlet, when Polonius hides behind the curtains, while evesdropping on Hamlet and Gertrude's conversation.