Among the hot topics that Rosie [O'Donnell] delves into is her painful childhood secret. She writes that as a child, she used to break her own limbs with "a baseball bat" or a "wooden hanger."[...]
On page 186, it reads: "My hands and fingers usually. No one knew. My secret." Why? "Proof," she writes, "that I had some value, enough to be fixed." And later, Rosie cryptically adds, "There were many benefits to having a cast. In the middle of the night, it was a weapon."
Used mainly on her own skull, I'm thinking.