Banksy.. is both a lefty and a tweaker of lefty pieties. At a London antiwar demonstration in 2003, he distributed signs that read “I Don’t Believe In Anything. I’m Just Here for the Violence.” Later, he produced revisionist oil paintings (Mona Lisa with a yellow smiley face, a pastoral landscape surrounded by crime-scene tape) and, disguised in a trenchcoat and fake beard, installed them, respectively, in the Louvre and the Tate. For the Natural History Museum, it was Banksus militus vandalus, a taxidermy rat equipped with a miniature can of spray paint.
Sources
New Yorker, May 14, 2007, p. 54