It's heart-stopping, high-altitude horror, as a skydiver becomes a human bullet, and a base jump goes terribly wrong. On the ground, an unexpected encounter, between buck and biker, and a rescue that just "bear"-ly gets the job done. In this hour, you'll see all this, plus a truck dips and a racecar flips. These are moments so jarring, they take your breath away. Hear from those who saw it, filmed it and lived to tell the tale.