On tour? Night before I left Leuven, I came around a sweeping corner on wet cobbles a bit too fast, hit a slick steel rain gutter, and went down on a beer bottle I had in cargo short pocket. Pulled a shard of glass out of my thigh, rode back to the hotel with blood streaming down my leg, and luckily had a fiancee who is medically trained to use my first aid kit patch me up. Cut wasn't bad, but I also pulled my groin, which made mounting my bike difficult the rest of the week.

First time I tried mountain biking in college, I started on a trail I had no business being on, hit some moguls on the bottom of a fast downhill, and jumped my bike into a tree at over 20MPH. Bruised half the ribs in my body. Didn't ride again til the next summer.