Wash the rice in a small pot until the water runs clear.
Top the drained rice with water and cook according to the label instructions.
When cooked, add the rice vinegar and fluff the rice with a fork.
Allow to cool.
Place a nori sheet on a flat surface. Top the entire sheet with rice, leaving a bit free at the top and bottom (use a bowl of water for your fingers to limit sticking).
Mix the tuna with three tablespoons of cooled, cooked rice, mayo, and a sprinkle of sea salt.
Arrange half of the tuna rice on the bottom section of the nori sheet.
Drizzle the tuna mixture with sriracha.
Peel, top and tail the snack cucumbers.
Arrange two cucumbers in a row on top of the tuna mixture.
Roll the sushi and wrap it together tightly.
Slice the sushi roll in half, and then cut the roll into equal pieces (I got 9).
Repeat with another nori sheet.
Top the cucumber 'eyes' with nori pupils (which you can cut out of a small piece of nori) and a dollop of mayo for the highlight in the eye.
Serve.