This happened when I stopped by a friend's house for dinner. They lived in a 3-story house, but their landlord rented out the third floor. I had to use the bathroom upstairs because the downstairs one was being used, and while I was in there I heard footsteps upstairs. It sounded more like a little kid running. I shrugged it off and figured it was just the upstairs neighbors.

After dinner I asked about them, (if they have kids, how long have they lived there, etc.) and she looked at me kinda weird and said they haven't had neighbors upstairs for a really long time. So I kinda freaked out and told her I heard something running and she was like, "Oh yeah, our house is haunted. The previous guy that lived here hung himself in the backyard and killed his family on the third floor. Now no one wants to live upstairs."

After that I was like, "OK THANKS FOR DINNER BYE." – ddun