It isn't all that big of a thing, but- well. I used to ride in downhill mountain bike races in my spare time, back when I was younger. I don't know if you know bicycling at all, but downhill mountain riding involves a lot of protective gear- flak jacket, leg protectors, extra-strong helmet. This is because you're usually taking unpaved, narrow trails with steep slopes at around forty miles an hour on a bike that weighs around forty or fifty pounds.

The summer between my junior and senior year at MIT, I competed in the Pacific Northwest regional championships. I was doing really well until my final qualifying round, when I lost control of the bike on a bad patch of trail and went over the handlebars at forty miles an hour. The bike went down the trail without me. Sati was all right, since I had her test tube under my chest plate, but I got knocked out on impact. Gave the paramedics who got to the crash site first a hell of a scare.