who knew?
Expressing surprise, or ironic lack of surprise, upon learning something.
A man who knew his job as he spent a long time commanding a regiment and who earned great respect from everybody. Aleksandr Vasilevsky
She fitted into my biggest armchair as if it had been built round her by someone who knew they were wearing armchairs tight about the hips that season. P. G. Wodehouse
And statesmen at her council met Who knew the seasons, when to take Occasion by the hand, and make The bounds of freedom wider yet. Alfred, Lord Tennyson
The person who knew you when you were young will seldom respect you as an adult. Lebanese Proverb
Never be boastful; someone may pass who knew you as a child. English Proverb
He who knew you when you were young will not respect you when you grow up. Lebanese Proverb