Or how they would look in front of people that are not present, or when they answer a certain question in a way that they feel would violate a taboo..... "of course a 50 year old shouldn't be able to date an 18 year old girl right out of High school! I see that when a taboo or moral situation get more into grey areas, the bias becomes less effective at increasing cognitive efficiency, more exaggerated in its expression, and much more error prone, i.e, producing responses that are absurd.