Yes, there's etiquette on how to eat sushi & what you can, must or never do while eating Japanese foodie.
The fine art of dining, Japs style.
ps: My bf does that 'dump wasabi into your soy sauce, turning it into soup' thingy everytime! Personally, I find that real unappetizing... sorry hun, truth hurts. Take it like a real man k. Bwahaha!