Dramatic Irony in a Streetcar Named Desire

Dramatic irony is when the words and actions of the characters of a work of literature have a different meaning for the reader than they do for the characters. This is the result of the reader having a greater knowledge than the characters themselves.
 http://contemporarylit.about.com/cs/literaryterms/g/dramaticIrony.htm


There is a great example of dramatic irony in a Streetcar Named Desire when Blanche continuously sings the lyrics to "Its Only a Paper Moon". Her singing of this song is relatable to her desired future with Mitch. On the other hand us as the readers are given the truth about Blanche and her scandals in Laurel such as having a relationship with one of her students thus causing for her casting out in Laurel. Therefore Blanche's future with Mitch lies in the hands of his believing of her act. Later in the play we learn that Stanely has reviled Blanche's scandals to Mitch in which us as the readers may then realize the dramatic irony present. This is because in scene 7 Stanley eventually tells Stella about Blanche's events in Laurel in which he then reviles that he has also told Mitch about her acts. Where is Blanche during this scene? Blanche is bathing in the shower while she is singing the lyrics to "Its Only a Paper Moon". Therefore the dramatic irony can clearly been seen as Blanche sings her about her future with Mitch the will never come to be as we as the readers know about her scandals along with Mitch, Stanley, and Stella thus Mitch will fall out of love with Blanche in the following scene (secen 8) where Blanche learns about Stanley's reviling of who she really is. The song also foreshadows the fact that Mitch falls out of love with Blanche after his vision of her is destroyed by Stanley and her acts in Laurel.