My brother did that once unintentionally. Up in the hills they had terraced them so a 2 story house could look over the one in front of it. Motorcycles and us on our stingrays would go down them. After a while we would get a little air and land 1/2 or 3/4 the way down. My brother came home with a bloody face, colapsed front wheel, and bent handlebars. Just a little to much air!