Man cracks his neck, ends up giving himself a stroke

I'm not going to venture a guess as to what percentage of the population regularly cracks their necks, but I have to imagine it's pretty high. A quick bend left and right is all it normally takes to produce the satisfying "pop," and for most of us it seems like little more than a harmless habit. Apparently that's not the case, and the story of one 28-year-old Oklahoma man is a strong reminder that toying with one's own spine can be a dangerous thing. A simple neck crack is all it took to turn Jo...