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Or, how not to be a total asshole to complete strangers, which could and should be the real title of this entry. Please expand.

# Before entering a classroom, a library, a concert, a lecture, a play, or a movie, put your cell phone on vibrate. PLEASE. (How about just turn it off or silence it completely? You can't answer it, why should you care if it's ringing?)

# Entering or exiting a building: look behind you to see whether anyone else is coming through the same door in the next 5 seconds. If the door will slam in the face of the person behind you, hold it open.