I made myself laugh once. Dropping off the back of a group ride in the country, I pulled over to take my jacket off. Putting a foot down on the grass verge, I discovered that it wasn't higher than the road surface as I thought, but lower, with long grass. Result: I kept on leaning until I went right over sideways, and ended upside down in the ditch under the hedge, still 'on' my bike, wheels spinning lazily in the air.
Fortunately, I wasn't at the very back, and someone came along and pulled me out. Once free, I couldn't help giggling over what I must have looked like. I only wish someone had got it on camera.