If the pressure is getting to you, whistle. In a barely audible way. It's the best way I know of to let go of tension. Music gets your mind off the situation, and the act of whistling melts the tension out of your body. ↗
After years in white theaters I dreaded working in colored houses. The noise, the stomping, whistling, and cheering that hadn't annoyed me when I was young was now something I dreaded. ↗
As a kid it's adorable to have a gap in your teeth. But then, because of the shifting in my mouth, I started whistling through it, and as a 32-year-old woman, whistling while you speak in sort of annoying. ↗