It was proper when having finished milking a cow [in Ireland] to put one’s thumb in the pail of milk, and with the wet thumb to make the sign of the cross on the thigh of the cow on the side milked, to be safe against fairies. And I have seen them when churning put a live coal about an inch square under the churn, because it was an old custom connected with fairies.’ (Evans-Wentz, 1911, 37)