Used Book Store Signage (SPOILER ALERT)

I visited a certain used book store near Eastern Market today and was entertained by its ample signage. Here are some examples of the signs posted throughout the store:

The entrance to the store. One sign instructs patrons to leave all bags/packages at the front desk, two signs specify the limited hours in which certain transactions can be made, and two other signs tell patrons not to use their cell phones inside (click the image to make it larger).

Apparently poetry readers aren't very good about keeping books in alphabetical order.

SPOILER ALERT?

An intimidating sign wishes patrons farewell as they descend the stairs.