The hero’s journey begins with the call to adventure. The call to adventure appears to be an accident— a stumble or a mistake—but according to Campbell, this is the mythic world bubbling up underneath the surface. This stumble connects the hero with the opportunity for adventure. Campbell uses the example of the Grimm’s fairy tale of the Frog Prince. A princess is playing with a golden ball, and accidentally throws it into a pond. A frog emerges from the pond and offers to retrieve the ball if she promises to invite him to dinner in the palace and let him eat from her plate. She reluctantly fulfills this promise and her adventure begins.