The National Post reports in its Friday edition Ontario Premier Kathleen Wynne expressed concern on Thursday about a marketing stunt that had people thinking a shark may be lurking in Lake Ontario. A Canadian Press dispatch to the Post says the YouTube video purporting to show three men surprised by a shark while fishing off a dock was posted a week ago. It was a hoax. Discovery Canada, which is owned by Bell Media, said it was a fake shark and part of their marketing campaign to promote an upcoming series on the creatures. Ms. Wynne said people who produce ads need to use common sense when they try to entice or frighten people. "There needs to be a quick enough turnaround that people don't actually become terrified about what may or may not be happening," she said. Some local residents on Wolfe Island, where the video was supposed to have been filmed, were scared. One man said he had to discuss the matter with his two young boys over the past week before venturing in the water. Upon learning the video was a fake, Wolfe Island Mayor Denis Doyle said it was rather concerning that people "do those kinds of such dumb things." Discovery Canada said was only meant as a "fun summer stunt."