A librarian should play hard-to-get while interviewing for a job. Never let yourself drool with delight at the mention of the prospective salary. Don't moan with pleasure at the sight of your potential office. And don't wet yourself with anticipation when you get winked at by the office slut.
Also, during your interview, limit yourself to three whines of the word "please" while clutching onto the Director's leg. Anything more would just make you seem desperate.