Biking 20:00 [1] 8.0 km (24.0 kph)
Bike to work. I used my clip pedals for the first time, which was interesting. I also crashed rather violently - as I was decelerating into a red light, my front wheel got stuck in a gap between a grate and the pavement that was just wide enough to accommodate the tire and narrow enough to stop it immediately. I flipped over - my rear wheel rising into the air over my frozen front wheel - and landed on my helmet on the crown of my head. Even after I came free of the bike, my bike was still locked into place. A few pedestrians stopped to ask if I was ok, though I was immediately responsive without any apparent damage.
I don't appear to have any of the symptoms of a concussion, though I will monitor the situation aggressively. I work next door to a hospital, so care is nearby as needed. I also need to replace my helmet, which has a crack.
And unfortunately, I did fall over once while clipped in - at the door to my bike parking area. Oops.
On the plus side, my left hamstring seems to have recovered. While I'm monitoring my status closely, there fortunately doesn't appear to be any significant damage either to me or the bike.