Out on a group ride, but a fair way behind the group, stopped at the side of rural road to take my coat off.
Roll up to verge, put left foot out to rest on verge, which was higher than the tarmac of the road. Except it was actually long grass I could see, and the actual ground was lower then the tarmac. So instead of my foot hitting solid ground as I expected, I just carried on going sideways. Fell onto verge (which sloped slightly away from road) with such momentum that I rolled right over. Sadly, I rolled right over into the ditch under the hedge. Result: me lying upside down, wedged in ditch, still 'on' the bike (literally, feet on the pedals, hands on the handlebars), but it sticking up out of the ditch, one wheel still spinning...
I was very glad that there was someone even slower behind me to come up and pull me out. For a moment or two, I was wedged and completely immobile. I sort of wish someone had caught it on film, it must have looked hilarious, and probably the most gymnastic thing I've ever done. I was picking bits of damp vegetation ought of my hair for the rest of the day...