Telling

Telling lies is very dishonest. Generally, this is a bad thing. But, there are times when lies are the only way! Take Santa for example: we tell children about this jolly man who gives presents to all the good boys and girls on Christmas; then, at a certain age, we tell them that Santa does not exist; this lie is very important, it ensures that the magic behind the Santa story will remain -- there's no magic when everyone accepts that he exists! That is why Santa arranges for parents to tell their children he is not real, to save the magic for future generations. So clever!