" Mom assured me that Marjorie had the strength to punch holes in the walls, and that plaster, particularly the old and crumbly plaster of the second floor, wasn’t very strong at all. I was supposed to find comfort in Mom’s explanation, but I still couldn’t quite wrap my head around what a night terror was, and I was equally concerned to hear that our walls were so weak. What kind of house had crumbly walls? "

― Paul Tremblay , A Head Full of Ghosts