There are cases where culturally, willfully, or otherwise, the normal knowledge of a subject that would normally be part of exposure in cultural education, formal education, or just common conversation is woefully wrong. It is not a simple case of just being ignorant, though ignorance often plays a part. It is based on speculation, rumor, myth, and biased assumptions from prejudice, stereotypes and clichés. It is possible for formal education to include materials leaving its recipients ill-educated.
Penalty to Checks: Checks are likely to suffer from Disadvantage or some degree of penalty. In such cases, the information will be noted with a penalty based on the level of misapprehension.