Every shark movie owes a debt to the sacred mother Jaws, but the thriller about bitey creatures spreading carnage and mayhem in bad weather that Thrash most resembles is Alexandre Aja’s superior nail-biter, Crawl. (By the way, where is that sequel we were promised?) Instead of voracious alligators preying on Florida locals trapped by a Category 5 hurricane, this time it’s a bunch of aggressive bull sharks and one very hungry pregnant great white cruising into a coastal South Carolina town when the levees break and the floodwaters rise. While the title begs to lose the first “h,” Tommy Wirkola’s...