The most frightening thing that ever happened to me was when I experienced hail for the first time. As a child I never heard of this mysterious phenomenon of "hail" falling from the sky. One day I was playing in an open field when the sky suddenly turned black and a ton of ice cubes, like the ones I put in my Calpis Water, started falling from the sky.
I remember thinking, "It's the end of the world. I'll never lie to my parents and I'll never pick on my little sister."