My todays nominees would be the people who try to fly in the wheel well of an airplane.
Obviously there's multiple dangers awaiting the eager well-traveler there.
-You can get crushed by the wheels
-You can get crushed by the doors closing/opening
-You can freeze do death
-Die of oxygen deprivation in airy hights
-You can fall do death
-Slide to death ( in case you fell out at a couple of hundreds of miles per second while the airplane is still on ground )
Surprisingly as it sounds, there seem to be records of hundreds such incidents, few of which survived.
I don't know what's mor baffling, how people actually find themselves doing such an incredibly stupid thing, or that some of em actually manage to survive.