Where in the story of romeo and juliet does foreshadowing take place?

When Romeo and his friends are contemplating  crashing the Capulets' party. Someone suggests that Romeo might find somone new there, better than Rosaline. He says that by comparison, Romeo will see such beauties that Rosaline will seem a crow when compared to these "swans." This happens, this is foreshadowing.I think this is right... theres more too

This has to be at least 20 words so :

When you see bubbles in your pancakes