People who are living in very large cities like New York are going to have to cope with all sorts of hazards that many other people would not expect. New York City is the home of the very wealthy and the very poor, and both groups come in contact with one another more frequently than they would in many other locations.
In this video, a professional actor allegedly managed to catch an intruder in the act of sneaking into his house, eating his food, and misusing his other facilities. He suspected that something like this had been going on, and he set up a video camera in secret in order to identify the potential intruder. It seems that he succeeded. People in areas that have a less dense population might be shocked that this is the sort of thing that could even happen. Sharing this video on Facebook would give lots of people a good scare one way or another.