Guess Which One's the "Naughty Librarian"

Library worker #1: Do I have to lick it?
Library worker #2: ... What?
Library worker #1: The envelope. Do I have to lick it?
Library worker #2: You could tape it, I guess...
Library worker #1: Great, because after last night, I am totally out of saliva.

Main Library, Kent State University
Kent, Ohio