Last night is really scared me. The class all went, me and other colleagues during work, he went out to help us to buy the night, I sat alone in the empty office inside while waiting for him. Suddenly, the little office printer rang, then click click Print. I was out of the chair, because such a large office only I a person, and I didn’t print something, it is haunted. I’m going out run it, just meet colleagues came back, he heard me out, then laugh, said before is go to print, did not at once.