As you were coming back to your room late at night, a 6 feet tall Ghost under a white sheet tried to scare you. Since you were sure it was one of your friends, you decided to play a trick on him. You went to grab some floor in the kitchen, followed by the Ghost who didn't understand why you were not afraid. Then, you quickly lifted the sheet and threw a handful of floor at the Ghost. You realised it was not your friend, as the Ghost's body was invisible where the floor didn't touch it.