Tumbling out of the wall, the fourth year Hufflepuff scanned the library for her next target. Locating a suitable subject, a ginger fifth year from Gryffindor with a bored-as-all-get-out expression on his face as he flipped through a charms book. She quietly tip-toed over behind her poor victim and attacked.
"Waahh!" she yelled, karate chopping the unsuspecting ginger.
"Bloody hell!" shouted the Gryffindor in surprise.
"Sshh!" came the clipped tone of Madam Pince.
They both froze for a few seconds, and then the Hufflepuff walked away and the Gryffindor went back to his studies.
Just another normal day at Hogwarts.