The Carburator joke

The car won't start," said a wife to her husband.
"I think there's water in the carburetor."
"How do you know?" said the husband scornfully.
"You don't even know what the carburetor is."
"I'm telling you," repeated the wife,
"I'm sure there's water in the carburetor."
"We'll see," mocked the husband.
"Let me check it out. Where's the car?"
"In the swimming pool."