What are some examples of foreshadowing in Romeo and Juliet?

Although the Prologue to Act I of the play does contain
foreshadowing, Act III, Scene 5 also contains many examples. In this scene, it is
morning and Romeo and Juliet awake after spending their first night together. Romeo will
leave Verona this day per the terms of his banishment for killing Tybalt. Of course,
they do not want the morning to come and when they realize it is morning, there is a
despairing mood to the scene. It is imperative that Romeo leave Verona that morning or
he will be killed. Romeo doesn't want to leave and he says to Juliet, "Let me be taken,
let me be put to death./I am content, so thou wilt have it so." Another example of
foreshadowing in the scene occurs once Romeo has descended Juliet's balcony and is
looking up at her. She says to him, "Methinks I see thee, now thou art so low,/As one
dead in the bottom of a tomb. Either my eyesight fails, or thou look'st pale." She's
saying that while looking down at Romeo, she got an image of him as laying dead at the
bottom of a tomb and that he looks deathly pale to her. Romeo responds to that by
saying, "And trust me, love, in my eyes do do you./Dry sorrow drinks our blood." He
tells her she also looks deathly pale and that sadness is sucking the life out of
them.