We also endure your wrath about paying fines, move heaven and Earth to find the reference work you need, spread tarp over the shelves when the ceiling leaks, recommend a movie that will fascinate your daughter's preteen pals at her sleepover party without offending any of their mothers, attempt to stop you from tearing pages out of our magazines, knock ourselves out to entertain your kids at story time, teach you how to open your own email, listen with sympathy to your confidences and — unfortunately — occasionally have to clean up after you.