Paper Disappears

Make a wooden pressure plate connected to a command block via redstone. Get some paper. Press "q" or whatever button to throw the paper on the pressure plate. Do it again. The second time the paper will disappear when it lands on the plate, yet it will be removed from your inventory. When you walk up to the pressure plate, you will get the paper back. Also works with items such as gunpowder and cobwebs but seems harder to duplicate with gunpowder. Also works with Survival and Adventure but seems harder to duplicate on those.