It's the most wonderful time of the year — and, no, we're not talking about Christmas, here, people. We're all about Shark Week! Yes, it's that glorious time of the summer when the Discovery Channel runs special after special about those beautifully vicious, sharp-toothed predators of the sea. And this year's festivities promise to be crazier than any of the rest, because Michael Phelps is racing a shark. Yup, you read that right. This Sunday on Phelps v. Shark, the Olympic champ will be…