Knock, Knock...Knock

Ok, so I have a crazy deranged neighbor! Apparently he and his wife just separated and ever since then he has been acting really strange and scary. Just a plum damn fool! It all started two weeks ago when he knocked on my door at 4 o'clock in the damn morning asking if we saw anybody coming up the stairs. Okay, who in the hell is up watching their stair way at 4 in the morning? Gotta be kidding me!? Anyway, he begins to apologize but said that someone taped a full, used condom to his door. Now, that is fucking gross first of all. Secondly, nobody wants to hear that shit! Especially not me. The next day he knocks again. This time it's about 9:00pm and he wants to know if my cousin and I want to go see Friday 13th. Uh, no! We don't know yo ass! Well, we didn't say it like that, but we said no. Last night, guess what? Another knock! But this time, it scared me. The first time he knocks it's about 11pm. He wants to know if I have some pain killers. I politely said no and sat back on the couch since I was having a case of insomnia last night. So, 15-20 minutes go by and here comes another knock. My stupid ass answers. Now he says, "uh, do you want to come over and we can order a pizza?" I was like,"No thanks. I'm asleep and it's too late for you to be knocking at my door." He said okay, apologized, and left. Why the fuck was he knocking 15 minutes later again!!!!! This time, I didn't answer. I walked to the door and said "Look! Stop knocking on my fucking door! I am trying to sleep and I don't know you so you need to back the fuck off before I call the police!". Here he goes, "I just wanted to know if I could come in for a minute. Just for conversation." OMG!!! At this point I'm furious, but at the same time terrified because I don't know this dude or what he's capable of doing. So, I stomped around the apartment really quick and came back to the door like I had gone to get something. I said, "I told you to leave me alone. Now, I have my gun right here ready to blow your fucking head off. If you do not leave right now, that's exactly what I'm going to do. Do you understand?!" He didn't say anything, but I heard him go into his apartment and close the door. Now this guy is either mentally ill or just plain crazy! It has to be one of the two. Whatever it is, I don't like the shit. I've reported him to the main office and if he knocks on my door again, I'm calling the police...No questions asked. What the fuck is wrong with people???