A woman calls an import parts warehouse and asks for a 28-ounce water pump.

"A what?" says the confused parts guy.

"My husband says he needs a 28-ounce water pump."  

"A 28-ounce water pump? What kind of car does it fit?"  

"A Datsun."  

As the parts guy writes down "Datsun, 28 oz. water pump" the light in his head goes on. "Oh yes ma'am. We've got 28-ounce water pumps. We have 24-ounce and 26-ounce water pumps too."  

"Finally," she says. "You're the first place I've called that knew what I was talking about."

"Yes ma'am.  That's because we're a full-service parts warehouse; it's our job to have the parts you need, like a 28-ounce water pump," he says, smiling, as he jots down customer pickup, Datsun 280Z water pump, part number...