Well, here's John Barrowman, star of our movie. He can't seem to stop chuckling. It's obvious at once that the shark hasn't got a prayer against THE AWESOME CHOPPERS OF BARROWMAN. (Mind you, we can barely glance him (or them) for all the T&A and significant cut-ins of cups of coffee.)
ETA: Our hero finds a shark tooth the size of his nose stuck in an undersea cable. Fortunately, he has a knowledge of ichthyology, and can reassure the cable's owner: "Sharks are always biting things."
ETA: Barrowman is out-acting everyone else in the movie without breaking a sweat. Also, there is visible grey in his hair! (If I was in this movie there'd be visible grey in my hair.) At least he's stopped chuckling, although now he makes little "hmmm" noises as though he's on radio.