You were walking along the school corridor. The hallway was empty because many children were at lunch in the dining room. You decide to stop and look at what is written on the walls. There were a lot of inscriptions, some even overlapped each other.   Suddenly you feel a strong hand roughly resting on your shoulder.   

"oops! Why are we going back and forth here? besides, all alone."

The guy was taller than you and slightly creepy.