In the wild world of novelty waves, surfers have ridden waves created by passing ferries, tidal bores, cruise ships, and even the wakes of tugboats. But a recent video from Vietnam may have uncovered one of the most unexpected weird wave setups on the planet. The footage shows massive cargo ships navigating the Lòng Tàu River, a busy shipping channel that serves as one of the primary maritime gateways to Ho Chi Minh City. As the vessels push through the narrow waterway, their displacement generates surprisingly powerful wakes that peel across the riverbanks. One ship in particular steals the show. The Ever Oath , a 639-foot cargo vessel sailing under the Panama flag, plows upriver and leaves behind a series of remarkably clean waves. As the wake interacts with the river's contours, sections of the wave begin to stand up and barrel, creating the kind of novelty-wave potential that immediately catches a surfer's eye.…