There's Nothing Better Than a Bike If You Want To Hurt Yourself [Video]
They say the bigger the bike, the worse the pain, but you can actually achieve impressive results using smaller dirt bikes, as long as they can build up some decent speed. All that's left now is figure out a nice trick you've never performed and build the prerequisites for it.
It's crucial that you overlook the controlled environment others use for similar things, and lacking practice as much as possible is also extremely important if you want to fail elegantly. In fact, knowing nothing about motorbike tricks and jumps is most likely one of the greatest assets.
When you feel ready to get hurt, just gather some friends, have one tape everything in HD and hit the gas. Jump like a brick or like a log, and results will never be late. Happy hurting!