People don't tend to need much of a reason to avoid shark-infested waters, what with the whole 'risk of being eaten alive' thing.
However, a Louisiana man and his girlfriend got as close a look as you'd ever want to have when a group of sharks (apparently called a 'shiver') swarmed around their boat in a feeding frenzy.
Dillon May was out fishing on a friend's boat with girlfriend Kaitlyn Dix and hoping to snag some yellowfish tuna 15 miles off the coast of Venice, Louisiana, when a whole shiver of sharks begun thrashing around them in the water.
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He thought he might be able to catch some fish of his own amidst the frenzied snapping of the sharks but was instead treated to the site of a huge amount of fish being eaten.
Some of them even tried to swim underneath his boat for safety, but the sharks had no worries about hunting them down.
Dillon told Storyful he had seen what he thought was a 'tuna boil' in the water, where many fish are thrashing around and feeding which makes the water look like it's boiling, but it was actually caused by sharks and not tuna.
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He said: "We saw it was sharks on a bait pod... never seen anything like it... no shrimp boats were in sight either!
"By the time we got there the sharks had found the pod and pushed them up against the boat to feast on them."
People found the footage pretty scary, as while Dillon and Kaitlyn were safe in their boat there was a feeding frenzy staining the sea with blood going on around their vessel.
It was definitely not the sort of thing anyone would have wanted to fall into, just in case the sharks mistook a submerged human for a delicious bit of fish.
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Sharks can be pretty damn scary to encounter and they do pose a threat to humans who get too close, and if you were out on the water you wouldn't want one popping up and doing a Jaws homage.
They can be dangerous to each other too, as sharks have also been filmed biting chunks out of each other instead of just keeping their dining habits to other species.
The bigger the shark the scarier people find it, although the number of sharks taking part in the feeding frenzy around Dillon and Kaitlyn's boat would also be plenty of reason to worry.
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Still, even sharks have to watch out for other creatures when out and about on the ocean, as killer whales have been spotted hunting great white sharks and eating their livers.
There's always a bigger fish.
Joe Harker