Ever notice this while you're gaming? This type of visual artifact is called "screen tearing". It happens when your screen displays multiple frames at once, which do not align. There are a couple of players at fault here: your video card and your display's refresh rate. When they do not sync up, your video card will submit another frame or image, before your screen is finished displaying the last one, which means you're seeing two broken images at a time. It can also occur when two equal frame rates don't sync at a specific location on your screen.
You can combat this by enabling your game's vertical synchronization (v-sync) option, but this is only recommended on single-player games as it can cause some lag between user input on the controllers and what is displayed. You can also try lowering the resolution of the video game or upgrading your video card.
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