Gosh....
I went to the hospital's emergency room recently. I am sure many people have died while there, maybe in the same bed I was laying.
I was admitted to the hospital and assigned a private room. Over the years, I bet people have died in that room, again maybe in the same bed I was laying.
One of my co-workers fell over dead in the break room. Enjoyed many a cup of coffee there afterwards.
The home you buy could have been the site of horrible abuse, from physical abuse between spouses to child sexual abuse. The home's owners could have been prolific swingers with sex parties and wife swapping.
The creep factor is everywhere.