Linguistic humor, Sitting shiva for Running Water

A young Jewish man calls his mother and says,"Mom, I'm bringing home a wonderful woman I want to marry. She's a Native American, and her name is Shooting Star."

"How nice," says his mother.

"I have an Indian name, too," he says. "It's Running Water, and you have to call me that from now on."

"How nice," says his mother.

"You have to have an Indian name, too, Mom."

"I already do," says the mother. "Just call me Sitting Shiva."