I remember…
Riding my bicycle down a sloping road. The front tyre rolls onto a chunky stone on otherwise smooth tar. An odd momentum occurs. I, and my bicycle are bouncing down the road, as though the ground were a trampoline.
At the bottom of the road I stop and the other two children I am riding with catch me up. They are laughing, and I am a somewhat puzzled — my brain is still trying to fathom what had happened.