File this under "things that should be self-evident", but new research has come out showing that the reason people occasionally gouge their own eyes out isn't because they want to have sex with their mother, or due to Christian religious guilt — it's because of psychotic illness.
“I gotta kill Dad,” I told my mom over Christmas. Her eyes widened. “Don’t worry,” I said. “I’m not going to have sex with you.” I paused. “I do need to kill you, too, though.”