Cory and Mr. Feeny switch roles for the day; Cory becomes the teacher, and Mr. Feeny becomes the student. Cory's lesson of the day is on prejudice. He shares the story of Anne Frank and explains how her plight exemplifies prejudice.
Grandpa Munster gave Eddie a magic potion that inadvertently caused him to grow a beard. While eating dinner, the Munsters find out that Eddie's beard dissolves in water. Herman takes the opportunity to instill a valuable lesson in Eddie: it doesn't matter what he looks like, but what really matters is "the size of [his] heart, and the strength of [his] character." This clip suggests that we should not judge others by how they look but by their inner qualities and how they treat others.