On the right as you enter St Peter's Basilica is this sculpture Michelangelo did when he was a fairly unknown 21 year-old, of Mary and Peter. In the 1970s a mad Hungarian leapt onto the statue, shouted 'you are not my mother!' and hacked off lots of bits of Mary before he was overpowered. Most of the pieces were retrieved but someone had pocketed the nose and a couple of fingers and because marble ages inconsistently the statue could not simply be repaired by getting a bit of marble that looked the same. Despite a worldwide plea the souvenir hunter did not own up (I wonder who has a nose and fingers hidden in their house?) In the end a plastic surgeon was consulted and some marble was shaved off the back to reconstruct the missing parts.