Ive heard 1 thing and seen another.

The first was my goddaughter. She was around 2 and she could speak well, she was talking to the wall in the corner of the room, so i asked who she was talking to and she said the man that used to live here. Proper spooky.

The other is my Auntie heard a noise downstairs at 3am and went into her kitchen thinking something had fallen over (she used to live alone.) She went in and she said it was as though someone was blowing cigarette smoke right in her face, so overpowering was the smell she thought she was going to be sick. 5 minutes later it was totally gone and there was nobody in the house, no windows open and she doesnt smoke.