How can the Japanese hear it?

The scene:
I am on the hammock at our terrace. My sister is in our living room talking to a woman from Japan through skype. My brother, also in the living room, is watching television.

My brother: (He increased the tv volume)
Me: Hey, lower the volume will you. Can't you see she's (our sister) talking to someone? The Japanese might hear it as noise.
My brother: Huh? How can the Japanese hear it, she's in Japan.

Somehow it made sense. I laughed so hard.