oxymoron

=Oxymoron= It is a figure of speech that the author groups two completly contradictory terms together. Such as "Jumbo shrimp" or "cruel kindness."
 * ox·y·mo·ronmedia type="file" key="oxymor01.wav" width="19" height="29" (Click here for a pronounciation)**

http://www.exceler8ion.com/wp-content/uploads/2007/06/oxymoron.jpg This picture is a perfect example, here the driver doesn't know whether he should obey the stop sign or the keep moving sign.
 * Examples-**

"So foul and fair a day I have not seen!" [|William Shakespeare], [|Macbeth], Act I, Scene III

"http://www.reference.com/search?q=oxymoron