Four Barrel Coffee has grown tired of some of their customers not cleaning up after themselves and failing to use their inside voices. So it decided to lay some ground rules. The sign became fairly popular on InstagramAfter a few days the sign was revised with a new rule: "No posting this on Instagram, you hipster"

Four Barrel Coffee is not your traditional coffee shop. Even though it is located in the Mission District, home to technology companies like Twitter and Zynga, Four Barrel does not offer Wifi. Don't be scared, you can disconnect from the world in the tech-free asylum of Four Barrel Coffee, you hipster. 

[Tech Crunch via Gizmodo]