Opie has always been an average student and while he doesn't ignore his studies completely, he also doesn't work as hard as he could. He's convinced however that his teacher, Miss Crump, likes him and that he'll do all right in his upcoming report card. Andy tells him it doesn't quite work that way but Opie's confidence is re-affirmed when he gets straight A's. Andy is so proud of him that he's bragging all over town about what Opie's done and even buys him a new bicycle as a reward. The only problem is the report card is a mistake and Opie, despite trying, can't quite bring himself to tell his father the truth.
—garykmcd