Try Holding Them in Front of a Mirror
You find a box in the attic.
This box contains several framed panes of glass. Each one is the size of your head. Looking into one of them will show a hazy vision of whatever you most fear will happen in the area visible past the glass. Other framed panes in the box do the same, mutatis mutandis, with regard to anger, sadness, happiness, insanity, et cetera.