Danielle is a mean preschool teacher and wants to teach her students to fear the school principal, who comes to check on their classroom at the same time every day. she attempts to use classical conditioning by turning off the classroom lights (US) immediately before the principal comes ibn (NS). The resulting darkness causes the children to be naturally fearful (UR). after a few weeks of trying this, Danielle is disappointed that the children do not seem to be developing a fear of the principal.