Sheep head, aka skapkop or "smiley", can be eaten with the fingers. You can eat the tongue, brain and eye, but the best part, according to most, is the cheek. The head is cut in two, so you can buy a whole head, or two halves.
Most of my friends think it's disgusting; I happen to think it tastes great, and if you're ever in a rural part of South Africa, you'd better learn to like it.
(The eye happens to be missing from this one, because - I confess - I ate it.)