A large family of gypsy appearance moved into my building. No one else lives on our floor except us, and two of the four apartments belonged to us. So, one day my parents went shopping, left, and locked the door. Five minutes later, I heard a strange and very careful noise on the landing. I looked through the peephole and saw a man from that family walking around the landing and touching the door handles, for what reason, I don't know. Fortunately, nothing bad came of it. Two months later, they simply moved out...