Don’t try this on your Nokia Lumia 900. This video shows this guy performing a toughness test on the screen. As you had seen before, most of these involves scratching the screen with coins, keys and etc. But this test is much worse than those. Watch the video
First, the Nokia Lumia 900 has to undergo a test where a nail is hammered onto the screen. Nothing happens. Next, instead of using a hammer, the Nokia Lumia is used to drive the nail into the wood. Warning, not for the faint-hearted who loves their phones.