My friend found out that the previous owner had shot himself in the house they had bought. They didn't find out until they had moved in and at first didn't know where but were told by neighbours he had shot himself in the end bedroom - hence the reason that half the carpet was replaced.
She was a bit freaked out at first but there was not a lot they could do about it at that point. A few years down the line the house is a lovely family house, she has since had her 3rd child and the sad ending of the previous owner is a rather distant, sad memory.
I'm not sure she would have bought it had she known before, but I know she is glad they did buy it now.