The Guardsman (1931)
[encouraging the Actor to test his wife's fidelity]
Bernhardt the Critic: Follow her now, or you'll never know. You'll *never* know.
Bernhardt the Critic: Nor will I.
[the Creditor has seen through the Actor's disguise]
A Creditor: Your own mother might not know you. Your own wife might not know you. And you might put on all the uniforms and all the whiskers and all the wigs in the world. But, as long as you owe me money, I would know you.