When I was six and my little sister was ~2, I was running her stroller down the driveway and stopped suddenly. She kept going. I got in trouble.
I wish I'd thought of that for my little brothers...they probably would have enjoyed being airbourne, if only for a moment...that's what I would have told my Mom anyway.
I had (and actually still have) a really evil younger sister who, at age 11, purposely pushed my littlest sister aged 2 years, who was in her stroller, down 3 concrete steps. At 55, my evil sister is really much more stupid than evil, and, fortunately, no damage was done to the youngest sister. Good thing too. The "baby" (age 45) and me (over 55)are the best of friends today. We gave up on the middle sister years ago...
Mrs NHD
and stopped suddenly. She kept going. I got in trouble.
And that is when you first realized the potential of a steam cat and developed a fascination for its mechanics and operation.