Smiley

The Smiley is the happiest type of mob in Minecraft. It likes to dance with its fellow Starters, chickens and sheep. The Smiley dances by shaking its head and four legs wildly, and jumping around while doing so. Also, if you give it a potato, its favorite food, it will give you a diamond block, along with two feathers. The Smiley is invincible, so you can't damage it at all. But if you use the kill command, (/kill), it will die and drop a Start Crystal. This was invented by Boomerstevv.