Okay kiddo, let me explain what an October surprise is. You know how sometimes people try to hide things from us? Well, politicians do that too. During elections, they might try to keep some information a secret or surprise people with new information right before people have to vote.
And that's what an October surprise is! It's a big news event or piece of information that comes out in October, right before a big election. It can be something good or bad, but it usually has a big impact on the election.
So basically, an October surprise is a last-minute sneaky move that politicians might make to try to win votes.