I just saw the 1965 movie Dear Brigitte, and it has this scene:
I want to tell you something. I don't want you to do it any more. Because if they find out about this, do you know what they're going to say?
They'll say, "There goes that Erasmus Leaf. He's a mathematician."
And we don't want that, do we?
Of course not. 'Course we don't. So ... We'll just keep this our own little closely-guarded family secret, huh?