My city has a bunch: The spoon lady, miniature horse guy, topless fat lady, the guy that rides his Harley around pulling a trailer with a pig in it, Johnny sax, blunt man, and guitar hero are all the ones I can think of off the top of my head. I live in a weird city.
Either the rock weighs exactly 500kg to an impressive precision and has been there for eleven thousand years or it weighs five hundred thousand kg and has been there for exactly 11 years.