I had a friend ride a bike of them multi story parking sheds, well this one was 2 stories/ 3 layers, we were in the second layer which would be about 1 story high, we were riding and th thing didn't have walls just those bricklets well we were racing and stuff there and I calle dhis name, he turned to look, next time I see him flying off the place
broke his arm and leg at that too
oh well, fater all I did want to tell him to slow down or els ehe could fall but I guess he found that out all by himself [:p]