Selling kidney.
This is after I die (or cryopreserve)? Or before? How much money?
It is currently only legal in Iran, where prices wouldn't be enough to cover the plane ticket out there. I recommend against it for Americans or Canadians until it becomes legal here.
As everyone here knows, it would be a stupid idea to switch from airplanes to cars out of safety/terrorism concerns: Cars are a much more risky means of transportation than airplanes. But what other major risks are there that many people systematically undervalue or are not even consciously aware of?
The same can be asked for chances.