Verbal irony : is a figure of speech in which the intended meaning of a statement actually differs, and is often the opposite of what is said,and most commonly used form of irony as is, sarcastic humor. Example : we hear verbal irony in conversations all the time. When someone ends up burning a cake or if the milk spills over and someone says "Oh Great" is one of the simplest verbal irony examples. Verbal Irony Examples in Literature In Act III Scene V of Romeo and Juliet by William Shakespeare, Juliet is upset at being told that her father has promised her hand in marriage to Paris rather than Romeo, who she loves. She has fully made up her mind to be married to Romeo, so she ironically states to her mother "…I will not marry yet; and, when I do, I swear it shall be Romeo, whom you know I hate, rather than Paris …" One of the most well known verbal irony examples is in the Prologue in Act I of Romeo and Juliet, which opens with "Two households, both alike in dignity, ...". When you first read this line, you may think that the two families are quite dignified or honorable. However, as the play goes on, you realize that each family is violently competitive. Thus, they are actually similarly undignified.

check out this link (Dramatic Irony ) http://classiclit.about.com/od/literaryterms/g/aa_dramaticiron.htm