TT Wilkinson's 'Lancashire Folklore' of 1867 says; "The following charms are repeated by children throughout Lancashire and Yorkshire:
The Crow Charm.
"Crow, crow, get out of my sight,
Or else I'll eat thy liver and lights."
The expression 'to eat crow', or 'eat crow-pie' is used in the USA as a way of admitting fallibility.
'Crow and Pie' is a cheery 15th Century ballad about a woman being raped and getting compensation from her attacker.