Note to Romeo and Juliet, 5.1.34: "Well, Juliet, I will lie with thee tonight."

Romeo and Juliet,
Act 5, Scene 1, line 34.
Romeo is saying that he will lie with Juliet in death, but "lie with" also means "make love with," so Romeo is being bitterly ironic. Instead of joining his bride in the act of love, he will join her in death.