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We’re a big fan of this.  The crowd reaction is priceless.

President Barack Obama greets surprised tourists at the Lincoln Memorial in Washington, D.C., Saturday, April 9, 2011. The President made an unannounced stop to thank people for visiting the memorial a day after he and Congressional leaders agreed on a bill to keep the government open. (Official White House Photo by Pete Souza)

h/t Ryan Grim