Not mine. From here.
Young Ernie and his family were invited to have Sunday lunch at his grandmother's house in Monkey's Eyebrow, Arizona. Everyone was seated around the table as the food was being served. When Ernie received his plate he started eating straight away.
'Ernie, wait until we say grace,' demanded his father.
'I don't have to,' the five year old replied.
'Of course you do, Ernest,' his mother insisted rather forcefully. 'We always say a prayer before eating at our house.'
'That's at our house,' Ernie explained, 'but this is Grandma's house, and she
knows how to cook.'