Irony

Irony is a form of expression in which an implicit meaning is concealed or contradicted by the explicit meaning of the expression. Irony involves the perception that things are not what they are said to be or what they seem. Dramatic irony lies in the audience's deeper perceptions of a coming fate, which contrast with a character's ignorance.

Irony is a matter of a perceived disconnection between words and real attitude or values of the speaker, rather than a difference between the denotative meanings of the words a speaker uses; the presence of ten thousand sporks, when all one requires is a knife.

http://en.wikipedia.org/wiki/Irony