Let Me In

Somebody is going to visit you. Its a calm quiet night. You can sit in your room and watch your favourite TV show. You can just relax and enjoy this calm night. But it looks like, you have a guest. Someone decided to visit you. Someone, who looks and talks pretty strange. You surely didn't wait for him. Your guest looks strange. He talks strange. His behaviour is strange. But it looks like, you should let him in (Should you?).