I haven’t ever gotten super badly hurt but the most painful experience I’ve had was when I went mountain biking one time and I pulled on the brakes a little to hard, I flipped over the handlebars and threw the bike up into the air with me. As soon as I hit the ground one end of the handlebars slammed vertically into my ballsack and then the rest of the bike onto my chest and face
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I had the same thing happen to me. Except I biked down a steep hill and didn't have the chance to use my brakes.