Whistling to keep myself from being afraid.
John Dryden (1762). “The Dramatick Works of John Dryden, Esq. in Six Volumes: Volume the sixth. Containing Don Sebastian, King of Portugal. Amphitrion: or, The two sosia's. Cleomenes, The Spartan heroe. King Arthur: or, The British worthy. Love triumphant: or, Nature will prevail”, p.193