Soba, a type of buckwheat noodle, is one of the most popular foods in Japan, but for those allergic to buckwheat, the dish can be deadly. Luckily, the food is so popular that most soba-allergic Japanese know of their allergies early on, but for visiting foreigners trying the dish for the first time, the results could be dangerous. A new temporary tattoo hopes to raise awareness of the dangers of soba allergies in a fun and creative way.