1. Mechanical failure
2. Pilot error
3. A jealous husband
RIP BOB!...this ones for you...
Oh, I have slipped the surly bonds of earth.
And danced the skies on laughter-silvered wings,
Sunward I've climbed and joined the tumbling mirth
Of sun-split clouds - and done a hundred things
You have not dreamed of - wheeled and soared and swung
High in the sunlit silence. Hov’ring there,
I've chased the shouting wind along and flung
My eager craft through footless halls of air.
Up, up the long delirious, burning blue
I've topped the wind swept heights with easy grace,
Where never lark, or even eagle, flew;
And, while with silent, lifting mind i’ve trod
The high untrespassed sanctity of space,
Put out my hand, and touched the face of God.
John Gillespie Magee Jr.
It is better to "buy the farm" doing something you love than many other ways of checking out.