"How much do you think it costs to open a karate school?"
"It can't be very much. Every karate school I've ever seen is just an empty commercial space with some mats on the floor, and perhaps a wall mirror. You don't know karate, though."
"Oh, I don't plan on teaching. I just think it would be rad to own a karate school."
"Where would one look for karate senseis? Sensii? What's the plural of sensei?"
"Sensei. Not many Japanese nouns have a plural form."
"Does 'atomic bomb'?"
"I digress. Where would one look for karate sensei?"
"Haha. 'Wanted: Karate Ninjas.'"