On the streets of San Francisco, it seems there is a story around every corner. And now, literally on some sidewalks, too. It's called a stencil story, and it is an "interactive, choose-your-own-adventure story" that is stenciled onto the sidewalk in the Mission District. There are two beginnings and four different endings depending on which path you follow. You can read a little about it here, and there was even short a New York Times article as well. Very cool. I'll have to check that out soon!