Speaking about disturbing stuff, those tuna eyes look haunting. Japan sure is the place to find unusual food, to say the least. If for some reason you ever wanted to taste tuna eyeballs it is the place to be. It's supposed to taste like squid and octopus. Tuna eyeballs are very popular there and can be found in the fish markets for a bargain price of 1$ a piece.
When you visit Japan next time and you're on a budget keep in mind that you can always turn to eating tuna eyeballs, maybe they will become your next favorite dish. Besides it is worth considering because of their high content of omega-3 fatty acids which are essential in every diet, that might even raise your IQ by a few points.