"Spaghetti factory? I know about that," he said. "They make the spaghetti, then they put it into bags and they put stickers on it. and then they sell it in a store!"
Elaine looked at him in amazement. "Where did you learn about that?" she asked.
"I know all about factories," he said.
"How? Where did you learn that?"
"I'm already four!" he said impatiently, "I know everything!"
Classic. Worth the trip.