A middle school kid tried to con me out of a fine amnesty coupon for a friend (who was not in the age bracket for the coupons).
I said, "No, you're just going to give it to your friend."
Kid gives me a shocked look, "You don't know that!"
Me, "Yes, I do. I can read you like a book."
"Because I am a librarian!"
(Yes, the older friend did get their fines taken care of.)