This image provided Thursday, June 18, 2009 by Chicago's Abraham Lincoln Book Shop Inc. shows an image made from an Aug. 1863 glass plate negative of President Abraham Lincoln at a portrait studio in Washington, D.C. The photo shows Lincoln with a house fly on his trouser leg just left and below his right knee. The photo proves that President Barack Obama, who swatted and killed a fly during an interview Tuesday, isn't the only president to have had an encounter with a fly.