What is an example of dramatic irony in Romeo and Juliet?

In Act 3, Scene 1, Benvolio makes an attempt to persuade Mercutio to stay away from the Capulets, in order to avoid fights between the families. Unfortunately, Tybalt shows up looking for Romeo and Mercutio impulsively challenges him to a fight.

Romeo shows up before the fight begins, and Tybalt attempts to challenge him, but Romeo he refuses telling Tybalt he loveds to. This leads Mercutio mto think Romeo is afraid so he steps in to fight Tybalt. Romeo attempts to stop the fight, but Tybalt wounds Mercutio who suffers a fatal wound.

This is irony at its best.