A pair of swimmers recently had a close call on a Destin, Florida beach with a hammerhead shark that was on the hunt. Onlookers called down to the pair after they spotted the shark, but at first the swimmers seemed to ignore the warning.

A video posted to YouTube shows two swimmers completely unaware of the shark’s presence despite shouts from several people behind the camera, possibly watching from a balcony, trying to warn them of the danger. The swimmers seem to think it’s all part of a joke, but once the hammerhead begins chasing a stingray, splashing wildly on the surface, they beeline to dry land. See the video here (explicit language warning).