BUCS 2011 X.C Carnage! from Joe Bowman on Vimeo.
Other than being entertaining, this video demonstrates the need for faultless technique when it comes to braking while going down slippery off-camber slopes. You see in the video many examples of heavy use of the front brake without distributing the body weight sufficiently backwards and consequently going over the handle bars. Thank goodness the landing surface in this race is soft!
Anybody, including children, who ride a bike should spend a good deal of time practicing again and again, their braking skills on a variety of surfaces, especially those that are off-camber.