Two sightings over the past few days have sparked speculation about whether there might be a shark on the prowl in the River Thames.
Just when you thought it was safe to go back into the water, eh?
Only kidding, under no circumstances should you go swimming in the Thames, not in Central London, anyway.
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Anyway, over the past couple of days two separate sightings have been reported, and some pictures captured, of what appears to be the tell-tale fin of a shark, swimming right through the capital of the UK.
John Hucknall, 23, was out for a jog with his mate when he spotted the 'fin' poking out of the waters near to Hammersmith Bridge.
Then, shocked bystanders saw the fin again, this time close to the London Eye, right in the middle of the city.
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Hucknall told The Sun: "My mate and I were running Hammersmith way by the river.
"As we were running we saw this thing sticking out of the water.
"I'm not David Attenborough but I'm thinking that's a big old shark.
"We took the photo and finished the run and kept looking back at it and thought there's something there.
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"If there is something going up and down the Thames it's a good time for it as there's hardly anything in there."
Hmm, it does look pretty convincing, doesn't it?
The next day, the folks in the centre of town spotted it coasting right by the Houses of Parliament.
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If it's just a piece of debris floating down the river towards the sea, it's making pretty slow progress, as it's not actually that far from Hammersmith to the London Eye.
One witness said: "Walked through central today and looked in the river... is that a shark in the Thames??!"
Another wrote: "Err! Is that what I think it is, a shark in the Thames."
Well, probably not.
The Port of London Authority refused to rule out the fact that it could be a marine creature, but there's no immediate danger of shark attack in the river as far as they're concerned.
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They said: "The dark object could well be a piece of debris or driftwood.
"We cannot give a definitive view either way from that photo, a shark is however very unlikely.
"However, if it is the dorsal fin of an animal, it is more likely to be that of a small cetacean such as a harbour porpoise. These are not uncommon in the Thames."
Featured Image Credit: Twitter/@AdamBarnskiTopics: UK News, Interesting, Weird, Animals, London