L.H.O.O.Q.

http://www.studio-international.co.uk/studio-images/dada/duchamp2_b.asp
This is titled L.H.O.O.Q. This was a print-out of the Mona Lisa and Duchamp added a mustache and goatee, then wrote L.H.O.O.Q.  At the time in France that was a sexual remark.  1919