I'd just moved into a basement suite. Everytime I went out I would lock the deadbolt but not the door handle but when I came home a lot of the time the deadbolt would be unlocked and the door handle would be locked. At first I thought I was just confused about which one I had locked so I started paying more attention. It kept happening and I realized someone must be going in when I went out. I assumed it was the landlady and was annoyed but didn't say anything at first. Then one day I came home and found the wrong lock locked again. I went in pissed off and opened the fridge to get something to eat. There was a book in the fridge that I had never seen before. I collected old books and this one was published in the early 1900s which creeped me out completely because it was like it had been left for me. I finally called my landlady and asked if she was going into my apartment and told her what had happened. She freaked right out, said the last person who lived there was a really creepy guy with mental health and drug problems. She got all the locks changed that day and it never happened again.