There you are, on the beach, when a Hammerhead shark swims right up to say hello.
This striking video was recorded on a beach in Navarre, Florida, on Tuesday, when a hammerhead shark swam to within a few feet of the busy shoreline.
Dan Flynn, the man who recorded the scene, told ABC News he had never seen anything like it.
"We could see the shark going towards a lady swimmer. And her back was to the shark, and she was unaware. You can hear people screaming in the video. I yelled, 'Get out of the water!'"
Local lifeguard Colton Boney was in the water at the time, assisting a woman, when he saw the shark move towards him.
He told WEAR TV "I never thought I'd be charged by a shark ... [it] continued to keep coming at us. I tried to put myself between her and the shark."
It's not clear which of the different species of hammerhead was involved. Only a handful of them are considered dangerous to humans - and there's no record of any fatality in the 33 recorded attacks by the species group.
Still, like the beach-goers in this clip, we'd be in no hurry to share the water.