Last night, I played the computer at 1 a.m. at my renting room as usual. Suddenly, I heard someone knocked at my door. I was scared and I thought maybe I turned the radio too loudly, so I turned it off. At the same time, unfortunately, some one MSN me and the sound was great loud. After hearing that, he knocked more seriously. I was so thrilled that I couldn't do anything. I just sat and waited until he went away. However, he continued for about five minutes. After a while, I heard nothing any more and I turned all the power off as soon as I could. The next day, I thought that maybe my friend came to my room and he forgot to bring his cell phone to call me, so I asked him if he came last night. Nevertheless, he told me that he didn't come. I was afraid again and I still didn't know who the man was.