I'd push my sister around in her wheelchair around when I was a kid and we would go over sweet jumps, do donuts in the snow and pretend to let go of the chair while going down big hills.
The best was when we were at Fort Mackinac and there is a very long, steep hill up to the fort. I was about half way up the hill and tossed my hands in the air like I accidently let go of the chair and let the wheel chair roll back about 12", she screamed bloody murder while I almost died of laughter. a Japanese tourist group about 20ft behind me formed a three person deep line of defense to catch her when she rolled down the hill.
Sis woulda killed me that day if she had the means.
you can see the walkway in the middle of the pic going to the fort:
