Bad luck dude,
One of my ****tard friends bought a dagger a few years back when we were out in town. We got home and hopped on the computer just to play some games or something, and he decides to point (more like tap) the screen with the tip of his dagger to show me something.
his arm caught on something and jolted forward when it got freed. He's lucky that the tip of the dagger was VERY sharp and only made a dent in the screen about 1 or 2 pixels big. Otherwise I would have gotten up and handed his arse to him right on the spot.
It's been there for about 4 years now. He dented it about two weeks after I got it.

I'm not sure that there is anything you can do to fix it. It annoyed the hell out of me for a few weeks, but now it's almost non-existent through my eyes.