Locate examples of dramatic irony in Act II Scene Two of Romeo & Juliet. One example is when Juliet is standing on her balcony. She thinks that...

Irony is a very useful literary tool and Shakespeare uses
it widely to convey meaning, to warn his characters or his audience, to create humor and
to intensify tragedy. There are three main types of irony and dramatic irony occurs when
the audience knows something that the characters do not or one character knows something
that another does not, something so crucial that it will change the anticipated outcome
in terms of what the unsuspecting characters are expecting. In Romeo and
Juliet, Romeo and Juliet have no idea that their fate is sealed and yet the
audience know right from the beginning; before the action even starts as The Prologue to
Act I says, "A pair of star-cross'd lovers take their life..."
(6).

Act II begins after Romeo and Juliet meet and each is
overwhelmed by his or her feelings for the other. The dramatic irony begins immediately
as Romeo comments on what he has overheard Mercutio say. He suggests that Mercutio has
never felt the pain of love, referring to "scars" and "a wound," and Romeo thinks that
he, unlike his friend, already knows the pain of love. This is an example of dramatic
irony as the audience know that the pain Romeo feels now, knowing that Juliet is a
Capulet, is nothing compared to the real pain he will feel when, later, he will pay the
ultimate price with his life.  

Romeo's reference to the
"glove upon that hand" reveals more dramatic irony because Romeo wishes to be so close
to Juliet that he is completely reliant on her, such as a glove would be in order to
"touch that cheek," (25) and he doesn't realize that his dependence on her will be so
complete that he will die after her presumed death. The audience may not yet know how
the young lovers will die but the fact that it knows that they will both face the same
fate is enough to create the dramatic irony.

There is
further dramatic irony in line 70 when Juliet expresses her concern that if Romeo is
seen, "they will murder thee" without her knowing that she is as much at risk as he is,
as the audience well knows.