It's one of many enchanting scenes in the classic film Sabrina: Audrey Hepburn in cooking class, breaking egg after egg into a metal bowl with one hand only.
Every time I crack an egg I think of that, but I no longer try it myself; I've learned my lesson. I get the cracking part right, but when I try to open the egg with one hand, I either put my thumb through it or just crush the shell in my hand. I've always told myself it's because my hands are too small -- Audrey Hepburn had disproportionately large hands and feet, she was always self-conscious about them -- but I'm pretty sure people with hands smaller than mine can do this.
What is the trick? Can any of you do this, and if so, can you teach me? Or is it something I'll have to resign myself that I can never do, like whistling through my fingers?