"Some graffiti has local or regional resonance, such as wall and street sign tagging in Southern California by gangs such as the Bloods and the Crips. The name Cool "Disco" Dan (including the quotation marks) occurs commonly in the Washington, D.C. area. One famous graffito in the DC Metro area appeared on the outer loop of the beltway on a railroad bridge near the Mormon temple as seen here. Its simple scrawl "Surrender Dorothy" summoned visions of the Emerald City of Oz and has remained on the bridge for nearly 30 years off and on beginning in late 1973." - Wikipedia
