My friend and I tried this when we were practicing a cheerleading routine. I was the one on the bottom. But I bent over too far, shifting our center of gravity too much, and down we went. I couldn't break my fall with my arms, and I didn't want to break my fall with my forehead, so I used my knees. Tore the hell outa my knees. But we couldn't stop laughing. Oy Vey!