Eko-in temple in Ryogoku (famous as the sumo area) has the grave of a famous thief of the 19th century. The famous thief ‘Nezumi kozo’ was regarded as a hero at the time. Because he was believed to steal money from rich families (who earned in a dirty way) and offered it to poor people.
His grave stone was thought to bring you good fortune and was shaved off by people before. But now it is banned. Instead, another stone representing the true tomb stone is put in front of it. People can get the fragments from the acting stone freely. Since it gets smaller, the present one is said to be the third generation.