When I was growing up, I learned the Sesame Street song, "One of These Things is Not Like the Other." Four objects were presented: Three had a common theme, and the other item did not belong. For example, three were fruit, like an apple, banana, and orange, and the other object was a pencil. By the time I finished the song, I had chosen which one didn't belong. Look for opportunities, like this one, to teach categorizing to kids, as it is a crucial skill in sorting and organizing.