"Don't look in your lunchbox until you get to school, OK?"
"You think I'm going to complain about what's in it, don't you?"
"I know you're going to complain, but that's not why. I put in a surprise," said the sister whose job it was that week to pack lunches.
"I bet I can guess what it is," said her sister. "Chocolate."
"No, I saw the package on the...