The street entertainers of San Francisco.
The Silver Man does the robot to music and puts a hand on your head! He's even got a impostor and a commercial based on him. He generally attracts quite a crowd.
Here is a couple typical Silver Man poses, you can also see how much parking in San Francisco costs!
The Gold Man is exactly like the Silver Man, but gold! They often perform not very far from each other. Here are a couple pictures of him doing his thing. The silver man is generally more popular.