I finally got the pictures from my sons disposable camera developed. He was particularly interested in the negatives. "They gave us extra film," he said. So I explained about negatives and how you could use them to make more pictures - provided you didn't get fingerprints all over them.
A couple of days later, while he was putting away some of his things, he says to me. "I want to keep the minuses, okay?"
Him - holding up negative strip: "the minuses."
Well, sure, he knows from his sisters math homework last year that negative numbers have minuses in front of them.
It all makes perfect sense now.