I've asked every realtor if the property has had any tenants pass away in it, whether I'm renting or buying. Some disclose no issue, some have said it's illegal to disclose (not sure about that, it was for a rental in MD). The rental they said it was illegal, there would be a knocking on my walls late at night, like, 2-3 am. Both the wall behind my headboard, and the wall attached to the living room. I never knocked back, and a few friends said I should have rolled a ball and seen if if it would roll back, then I'd "know it was a child ghost."

No thanks...

A buddy of mine, though, lives next to a house that was originally built as the town morgue in the 1700s. He's said even when he's visited, he's seen lights flicker and stuff. His story, though, was about a couple renting the house. I guess the guy was an abusive asshole to the woman, and they were going at it one night during a storm. He raised his arm to hit her, and they both swear they saw a man standing between them, facing him with a very nasty look on his face.

She left him shortly thereafter and he moved out. But my buddy swears whatever was in that house had had enough him beating on her and made it clear he was being watched.