Happened to me the other week. I was riding along (only 18 speeds though) and a furry blur crossed the road, rapidly approaching me from the left. Unfortunately for him, our paths met just as my left pedal was downmost and I inadvertantly kicked the poor sucker at about 20 mph. The impact knocked his nuts (the tree varaiety) right out of his mouth...
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Get a bicycle. You will certainly not regret it, if you live.