This image released by the British Museum on Thursday May 19, 2005 shows a hoax cave painting of a primitive man pushing a supermarket trolley which was on display in the British Museum in London. The work was planted by an anonymous 'art terrorist' called Banksy and museum staff were alerted Wednesday May 18, 2005, after he put a message on his website, saying that the 10in by 6in rock, 'had remained in the collection for quite some time'. This is not the first time Banksy has stuck fake objects to gallery walls and waited to see how long it takes before curators notice. (AP Photo/British Museum/HO)  ¶ 5:58 PM