Falling asleep while riding to work when I was 16.
My front wheel clipped the curb and I woke up suddenly with one arm and one leg each side of a street light pole. THUD.
I then fell backwards - got up - dusted myself down - got back on the bike and rode to work now very awake.
I was working as an apprentice chef and was on my way to do the breakfast shift at some unearthly hour.
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