The thing that most bewilders our library patrons these days is our puzzle exchange. We usually have two or three dozen fairly nice puzzles on a display and on a table, with a sign saying something like
Extra puzzles at home? Bring them in. Want a puzzle? Take one home."
This is enough to drive library patrons straight to me at the front desk for more information.
"So how does this puzzle exchange work?" They ask, confused.
"It is sheer, unbridled anarchy." I answer. "It is like the end of the world has come and there is nothing but stacks of puzzles. You can do whatever you want with those puzzles and no one will stop you."
"Oh." They say.
And they usually walk out with a puzzle.