I rode into thin air once, and it hurt.
At the time,I had a dodgy back light that would go out until I hit it. So I looked back, found the light had gone out, and reached back to the back of my rack to hit it. About the 3rd blow, it came on, so I looked forwards and found that I'd veered from the straight and narrow and was in the process of riding off the road and heading straight for a tree. So I dodged the tree, and then the ground vanished.
The road was built up on a bank across the floodplain, and I'd gone off the road just where there was a culvert under the road. It was about 6 feet down to the water, plus about about a foot of water and 6 inches of mud. The hurt was that I'd still got one hand on the brake hood when the bike landed, and my thumb got bent backwards.
This is it. The bike is where I rode off. If I'd dodged the tree the other side, I'd have hit the end of the bridge parapet, and it would doubtless have hurt more.