Pandora's Box is a kind of lucky block in Minecraft PE. This means that you need to craft it first using 4 redstones, 1 obsidian and 4 wood planks. Then, when it’s ready you need to tap it to activate a random effect. Before the activation you will be given three choices: bad, good and impressive. So, you will never know what you get, as it could be anything from flying pigs to diamond fountains.