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Sharks only eat like once or twice a week and are very shy creatures, so not much to worry about. You're more likely to be killed by a coconut.

It was a joke about a silly movie premise

That comment might also have been a joke, ironically and intentionally missing the point that perhaps there aren’t that many sharks in the Seine.

Or coconuts.

One could be carried there

So could a shark

Not by a Swallow

It could grip it by the husk