The whole point of sushi is that the fish you eat is still completely raw and with regards to taste, the fresher the better.
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Having said that, it’s probably good to at least make sure that the thing is dead before you eat it. The restaurant below obviously didn’t make that precaution, as they served a customer a piece of fish that was still moving.
The video below shows the lump of sushi with a tail sticking out. Even though it appears to be battered, unbelievably the tail is still flapping around. If that wouldn’t put you off dinner, I don’t know what would.
https://www.youtube.com/watch?v=O1hASGR0I1s
So gross. As said, if you’re going to eat an animal, make sure it’s properly butchered first.
Still, this is no way near as bad as the video of the girl attempting (and nearly failing) to eat a live octopus. What is wrong with people?