What Are Examples of Foreshadowing in the Play "Romeo and Juliet"?

A primary example of foreshadowing in William Shakespeare's play "Romeo and Juliet" occurs in Act 1, Scene 2, when Benvolio tells Romeo, "Take thou some new infection to thy eye, And the rank poison of the old will die." Romeo, encouraged by Benvolio, soon forgets about his old flame Rosaline when he first lays eyes on Juliet.