I think these are hearts. Or some kind of bizarre innards anyway.
Freaky sea monster.
Sea urchin. It'd have to be a lot cheaper than half price to tempt me.
OK, so this was at a sushi bar, not the supermarket, but it's massive octopus tentacle sushi. We actually ate this one (as opposed to all the ones above). It was tasty enough but too chewy and the suckers kind of popped as you bit them. Gross.