I have adhd and found out a few yrs ago, one of the symptoms is not knowing where my body ends. sooo, I did a lot of walking into walls, and when I was about 3-4 yrs old, I would jump off the garage roof. it was a lot of fun, and much better than jumping out of the second floor with an umbrella, that mary poppins thing never seemed to work for me. you don't sail around like they show in the movies. when I was little I wanted to drive a wrecking bsll, I gsve up about 10 yrs ago on that one. I figured it would be fun to knock things down all the time. I also loved setting fires with a magnifying glass. I was kinda a terror back then.