Don't touch the piles
Once upon a time you entered a bookstore where books were in piles. Not a Barnes & Nobel organized piles, but some random piles like a perfect play for hide and seek. Of course, only if you like playing hide and seek with random books.
Among the piles, you will find treasures. But hussss... don't touch the piles unless you have a well-defined insurance that covers book piles related accidents.
Because accidents do happen and book piles do collapse, and you do get covered by those hard and paper covers, and man, they hurt.
The look of pretended guilt (while the outburst of laugh is stronger) and the look of ´I kill you´ (and here the lack of sign of any laugh is tangible) wave around the lines of piled books and the formerly piled, now, collapsed pile of books.