I'm a historical reenactor, and I've done educational bits for elementary schoolkids. Every Damn Time: A teacher in the gathering will ask a question... and be

I'm a historical reenactor, and I've done educational bits for elementary schoolkids. Every Damn Time: A teacher in the gathering will ask a question... and before we can answer, one of their students does. Correctly. Or: "Why isn't (some tiny detail) correct?"