Riding a motorcycle. Without a helmet in many states.
Motorcyclists suffer astronomically high fatality rates -- roughly 25 times higher than automobile passengers per mile driven.
Motorcycle Crashes
(And not bashing motorcyclists -- I used to ride and have no objection to anyone (other than my family) riding.)
Cough...
You do understand that motorcyclists normally die on the road because an idiot was allowed to drive a car right?
If you measure At Fault fatalities, car drivers are more than ... 100 times more dangerous than motorcycle drivers.
Car drivers in general are talentless, distracted, poorly trained, and lack depth perception.
Very, very, very few car drivers know the limits of their car, or how it behaves when pushed hard. Certainly less than 1 out 10 car drivers are actually trained in emergency procedures. Motorcyclists in our state require emergency maneuver training. You must do everything a car driver is required to do, plus an extra motorcycle defensive driving course.
Very few states, (none?) require a car driver to have defensive driving training.
Our entire family has multiple defensive driving courses. We know how dangerous it is today, and train according. Wifey and I both have multiple competition licenses as well.
Cliff Notes: Motorcycles aren't 25 times as dangerous. Car drivers are the proven killers. Ban car drivers who don't have 40 hours behind the wheel professional training on a closed course, and watch bike fatality drop like a rock.