I used to travel around with a tap troupe in my area when I was in school. One time, a few of us were just standing, talking in a small group. My friend didn't do anything more than shift her weight from one foot to the other when she lost her balance (real graceful, I know!). Because we were on a tile floor and she was in tap shoes, the sudden moment sent her into a face dive! Being the caring, concerned friends that we are, we proceeded to laugh and point at her!