Did you mean to post the link to a kid jumping on a trampoline?  I figured it would be a real horse.

My first horse was a wild pony stud "adopted" for $25.  My ex-stepmother rode him till he quit bucking and then put me on him.  Couldn't keep him penned away from the mares and he would walk right on the edge of the paths when we rode in the gravel pits and scare the $%&^ out of me.  I know he did it on purpose.

I can't believe this one.  http://www.youtube.com/watch?v=UiH3zgo-yU8&feature=related

Eventing has all their own type of crashes...to music no less...

http://www.youtube.com/watch?v=RAuQc3BF0i8&NR=1