Sushi and sashimi should be served fresh - but perhaps not this fresh.

In my many years in Japan, I have twice eaten fish that was still moving. In one instance I ate sashimi of a small fish that was still trying to breath, i.e. the gills were still moving (despite the fact that the head was severed from the rest of the fish—it was only a nerve reaction). In another instance, I swallowed miniscule fish (1 cm long and translucent) that were swimming around in a vinegary liquid. They are swallowed whole with the vinegar, and you can feel them riggle down the back of the throat.

But never had I see what I saw this morning. (video)