Along with danger, suspense, and a highly satisfactory ending.
Eric Carle's picture book Do You Want to Be My Friend? enthralled both the three- and four-year-olds in the story circle and the five and overs. And the pictures are mysterious enough to elicit some wrong guesses from adults as well.
This tail’s owner is too busy munching grass to befriend a little mouse.
Perhaps the owner of this tail . . . .
Oh no! This tail's owner is hungry!
As the little mouse searches for friendship, danger looms, long and green, at the bottom of the page until . . . .
The story ends with the right word (just one) and--Oops! No spoilers!