foreshadowing: an advance sign or warning of what is to come in the future
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I don't know if we can consider the foreshadowing evil but certainly there is foreboding.
The Prince warns of the future consequences of starting anymore trouble in the city streets..."your lives shall pay the forfeit of the peace"
Juliet says she'll try to check out young Paris but isn't sure she will like him,”I’ll look to like, if looking liking move."
Romeo is concerned about what might happen at the party, “I fear, too early. For my mind misgives some consequence, yet hanging in the stars..."
Tybalt threatens to get back at Romeo at the Capulet party, “I will withdraw. But this intrusion shall, now seeming sweet, convert to bitterest gall.”