I think I'm climbing a mountain, but I might also be in a several-story building on a mountain. I see a plane fly by from right to left, strangely close and low, and then bank and turn around to fly by again, from left to right, very close to the ground. It start grazing the ground and kicking up debris, and I realize that I am watching it crashing. It disappears into the brush, and I think that I should be quicker with my camera.