Exclusive documentation over at the wooster collective of Banksy's visit to NY
Dressed as a British pensioner, over the last few days Banksy entered each of the galleries and attached one of his own works, complete with authorative name plaque and explanation.
Lets see how the US handles this breach of security, The Tate Britain dealt with the same prank pretty well stating the artists painting was available to be picked up from lost property.
Banksy in New York