Cold start, but soon warmed up. Hit a patch of sheet ice which was invisible until we were on it and came a cropper. My commuting buddy was in front and so I had the horror of watching him go down, knowing there was little I could do for myself, I managed to unclip my left foot just as the bike decided to take me onto my right hand side. Cracked my knee with the stem and banged my elbow, followed by what i'd like to think was a fairly spectacular slide along the icy road. Bikes and riders OK, barring a few bruises. Trying to walk in cleats on ice is not funny either.
Oh and about 14 miles later i went over a large bump and my pannier jumped off into the road - luckily very quiet so no-one ran over my sandwiches.