What Jim wanted to do, and it was totally his vision, was to get back to the darkness of the original Grimm’s fairy tales. He thought it was fine to scare children. He didn’t think it was healthy for children to always feel safe.
Frank Oz, as quoted in Q&A: Frank Oz on Henson, “Dark Crystal” and the Kwik Way, SFGate, (Jun 28, 2007).
And he shall kill the lamb of the trespass offering, and the priest shall take some of the blood of the trespass offering, and put it upon the tip of the right ear of him that is to be cleansed, and upon the thumb of his right hand, and upon the great toe of his right foot:Leviticus 14:25 KJV