Stupid Patron Tricks
Found this weird little startle-the-librarian trick on TheHook.com.
"You locate several books of nearly equal size and weight, and begin by placing one overhanging a library tabletop edge just far enough so the book's center of mass does not engender torquefall to the floor." TheHook.com, by the way is the homepage for Charlottesville, VA. They sure have some pranksters, there, I'm tellin' ya.