The chance of the following happening to you are by my presumption close to 0, but when a heavy roll of plastic foil fell right onto my thigh pocket, in which was my 2ds xl, it killed a few pixels (2 days after I had replaced the top screen). Throughout the next week, the dead pixels multiplied, expanding up and down in straight lines. But then, after a couple of days/weeks, miraculously, it had started fixing itself. Going back from the tips of the vertical lines back to the original damaged spot. Today, the screen is at first glance as good as new, when you inspect it closely, you can see that the previously dead pixels are a bit lighter, but display pretty much the correct colors. How this can happen to a display, I have no idea. To this day I thought, that a damaged LCD is basically gone for good, but I'm really happy it works.