The fox invited the stork to dinner. The main course was soup in a shallow bowl. The fox licked the soup with her tongue, but the stork couldn't eat with her beak. She went away frustrated and hungry.
A few days later, the stork invited the fox to dinner, and she served the food in a glass vase with a narrow neck. The fox could see the food but she couldn't get to it with her tongue, while the stork was able to easily eat the food with her beak.
Thus the stork got her revenge: turn-about is fair play.
Inspired by: Mille Fabulae et Una, a collection of Latin fables that I've edited, free to read online. I am not translating the Latin here; instead, I am just telling a 100-word version of the fable.
Notes: This is fable 469 in the book, which is Perry 426.