Hats, Wearing

A polite librarian should never wear a hat at the reference desk... unless you plan to subtly make it an essential element of your reference interview technique.

Humiliation, Feeling

A librarian should never allow her-/himself to be videotaped while dancing and singing about libraries.  Find the part of yourself that says, "This will be cute!" and remove it from your body with a dull letter opener.

Booktrucks, Loving your

Book trucks are a hot commodity in libraries. Protect them. Label them for your department so that they don't wander. Send out accusatory mass emails when they go missing. Decorate them. Rotate their tires every 7,000 miles. But please, please, please, please, please.... spare us all and don't dance with them.