Up until last November I was happy to say I had not fallen off in thirty years.
Apart from childhood prangs the only offs I had previously were (1) Around 15 years old, racing to school, downhill left turn in the rain: both wheels slid from under me. As motor-racing commentators say: it was ambition over adhesive. (2) Late teens, art college, riding with an A2 portfolio under my left arm, which I did regularly, reached down to the down tube for the gears (that's how long ago it was) and I don't know what happened but the next moment I was in a tangle on the ground. (3) Early '80s commuting home in the rain, mis-judges a pavement dip which had a bigger lip than I expected due to it being concealed in a puddle, hit it at an oblique angle and went down.
After that thirty years of crash free riding. Until November when I was taking my 7yo daughter on her BoBike seat along the canal tow path. There are three very steep bridges near Kensal Rise. Three in a row and spaced out, so awkward for both of us to get off the bike and walk. Over time we experimented with various approaches: speed up first, or go steady and gear-down. On this occasion I tried it slowly in a very low gear and near the top, with my daughter's weight behind me, the front wheel just lost lateral adhesion on one of the pedal strokes and flicked sideways without warning. We both shouldered the ground laughing.