The only time i`ve fallen is when I couldnt unclip my left foot for some reason, so unclipped my right. However, as I always unclip my left so I can put it on the kerb, verge, my brain seemed confused and could`nt work out how to stand still with my right foot solidly on the ground. I did a little dance and then fell over - luckily there was no-one around but a starling gave me a look that said, ha ha, ya dick!