Act 3 Scene 1 Page 866. Mercutio is threatening Tybalt and trying to make him fight. He's boasting by saying that he's going to kill him no matter what and that it would be easy.
[Mercutio]: Good King of Cats, nothing but one of your nine lives. That I mean to make bold withal, and, as you shall use me here-after, dry-beat the rest of the eight. Will you pluck your sword out of his pilcher by the ears? Make haste, lest mine be about your ears ere it be out
[Tybalt]: I am for you
Act 1 Scene 5 Page 828. They were being impulsive because they just met and now they are kissing, They don't even know each other's names.
[Juliet]: Them have my lips the sin that they have looked.
[Romeo]: Sin from my lips? O trespass sweetly urged! Give me back my sins again.
Act 3 Scene 1 Page 869. Romeo just killed Tybalt and is about to get banished from the town
[Romeo]: O, I am fortune's fool!
[Benvolio]: Why dost thou stay?
Act 1 Scene 5 Page 827. Romeo is an enemy to Tybalt as is Tybalt is an enemy to Romeo
[Tybalt]: 'Tis he, that villain Romeo.
Act 3 Scene 2 Page 872. The nurse came in crying saying that HE'S dead
[Juliet]: ...And thou and Romeo press one heavy bier
[Nurse]: O Tybalt, Tybalt, the best friend I had!..