These are all great stories,
Here's mine, it's funny because it's 100% due to my own stupidity.
I was riding home from a baseball game, at night, with no lights, while drunk, with no helmet... stop me when the picture becomes too clear... Anyway I wind up on my stomach in the middle of a darkend road construction site thinking "Why am I here?". I'm not very philosophical by nature so I was thinking more of my immediate predicament, not my theological/idealogical one. I get up, notice that my new leather jacket saved my arm from hamburger (cows are good, m'kay) and my ribs and arms are sore, look at my bike and noticed that my front wheel was missing a few spokes, I began laughing (drunk people are easily amused). Apparently I fliped over a stack of rebar that blended into the night. Short story long, I got back on my bike and rode 'bout 1/2 mile home on a wobbly, flat front wheel. My ol' lady didn't think it was as funny as I did, but she was sober.