Hmm
Are you thinking of
images.icnetwork.co.uk/upl/m2/oct2005/3/4/00008085-C19E-1350-B1390C01AC1BF814.jpg

It might be a banksy though as he did others like it
(BiggLes |_337 |$ ()\/3rR473|), Wed 23 May 2007, 23:14, archived)