Bucked off a young horse while cantering along a hard-packed dirt road. Kicked in the ribs as I fell. Landed hard. Broke four ribs. One of them punctured a lung. Three days later, fainted from lack of air. Four days in hospital with a stent draining the lung. Two weeks in bed. Six weeks for the bones to heal. A year before the pain subsided. Two years of mild pleurisy.
I've been much more careful with my training of young horses since then.