Halloween Costumes for 2011 (Flickr/StormyDog)

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A Shark
It has been a bumper year for the elite predators of the deep, sneaking a few snacks off the coast of Australia and even dramatically taking a poor fellow's leg in the Cape. Now the Ozzies are baying for blood, but the shark clearly has more support on its side. So you'll have no problem making friends - just be careful of the people dressed like Wallabies. The tricky bit here is actually finding a shark costume that you won't seem stupid in (after all, we humans look nothing like them). And if the costume is awesome, it leaves the problem of how you will eat and drink. Also, some idiot might try to throw you into the pool. On second thought, just leave the sharks alone.