Whenever I feel afraid
I hold my head erect
And whistle a happy tune
So no one will suspect
I’m afraid. […]
The result of this deception
Is very strange to tell,
For when I fool the people I fear
I fool myself as well.

Oscar Hammerstein II (1895-1960) American librettist, theatrical producer, and director

“I Whistle a Happy Tune” (song), The King and I (1951)