In sympathetic magic there is a spell where we can create an effigy of someone, or a part of someone and if you include a part of them in the figure, a hair, a nail, it doesn't need to be big... But the point is, the person can feel anything that happens to the poppet, and well take a long, hard look at the effigy I made of you!
You know what else?
I'm not feeling particularly sympathetic!