eat your wheaties
A mean way of telling you to be ready because you’re going to be tested. You better be as tough as a bullet or you’ll be crying like a baby.
Your sister says, 'Eat your wheaties or I’ll make you eat your homework.'
Your neighbor yells, 'Eat your wheaties or I’ll eat your goldfish.'
Your boss says, 'Eat your wheaties or you’ll be eating your paycheck.'