Based on the original ‘Shopping cart is the ultimate litmus test‘ post on 4chan that became a classic copypasta
Doretta's head is the ultimate litmus test for whether a dwarf is capable of self-governing. To return Doretta's head is an easy, convenient task and one which we all recognize as the correct, appropriate thing to do. To return Doretta's head is objectively right. There are no situations other than dire emergencies in which a dwarf is not able to return the head. Simultaneously, it is not illegal to abandon Doretta's head. Therefore Doretta's head presents itself as the apex example of whether a dwarf will do what is right without being forced to do it.