"The other day, I went to the sushi restaurant that you recommened."
"How was it?"
"It was delicious. By the way, when I was looking around, they dipped sushi in soy sauce with fish up side down like this and bit it one time. Is it the best way to taste?"
"I hear they eat tsuna like that."
"I wonder why they have tsuna up side down?"
"That's to say if tsuna is wrong, their tongue become sore soon."
"Then it's doubtful that B is a gourmet."
A began to laugh.