I have fallen once or twice by forgetting to unclip, and I also undertook a car just as it was about to move off (traffic in front had started moving) and the driver didn't look and clipped my rear wheel and I went down. Slight pain in knee / hand but nothing major, although the mount for my air zound broke was 50:50 in terms of fault he should have looked, I shouldn't have done it. Learnt from that!

Stay safe out there.