Imagine you're sitting in the window seat of a long flight. Your legs are cramped, your butt is numb, and you've about had your fill of salty snacks and small cans of Ginger Ale.
You yawn, stretch, rub your eyes and think about the first thing you're going to do when you land and finally get out of the airport. But then you look out the window and notice something different about the plane's wing.
Mainly, that it's falling apart.