If you could grow an extra appendage...

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If you could grow an extra appendage, what would it be? Where would you have it grow from? Why? Just some ground rules: This appendage grows almost magically, with no pain, over night. No other unforeseen side effects. Do keep in mind other people's reaction to your extra appendage. This appendage can be animal or human but nothing you wouldn't see on a living creature (no computers for brains or bottle openers on your tongue.) If you would have a large muscular growth, like a giant pair of wings, keep in mind you would have to eat more and take care of your wings.