Surrender Dorothy

"Surrender Dorothy" is a famous special effect used in the movie The Wizard of Oz, which later attained local fame as a graffito in the Washington, D.C. metropolitan area.

The first appearance of the phrase is in the famous 1939 film version of The Wizard of Oz. In the scene, Dorothy Gale (Judy Garland) has reached the Emerald City with her companions The Scarecrow (Ray Bolger), Tin Woodsman (Jack Haley) and Cowardly Lion (Bert Lahr), whereupon they are treated to the hospitality and technological comforts of the fantastic city. As they leave the "Wash & Brush Up Co.", the Wicked Witch of the West (Margaret Hamilton) appears in the sky riding her broomstick, skywriting the words "SURRENDER DOROTHY". The terrified townspeople of the Emerald City - and the four intrepid adventurers - respond by rushing to the chamber where the Wizard of Oz himself (Frank Morgan) resides, only to be turned away by a Majordomo (also played by Frank Morgan) based loosely on the Soldier with the Green Whiskers.
source: Wikipedia