Once upon a time, in a muddy pond, there lived a very fat frog named Fredrick. Fredrick loved to eat—flies, beetles, even the occasional lily pad. One day, after a particularly large lunch of dragonflies and a slice of algae, Fredrick felt quite bloated. He waddled over to a rock to rest, but as he hopped, he accidentally bounced off a lily pad and landed right on a small fish, who went spinning through the water like a torpedo.
The fish shot up and said, "Hey, watch where you're hopping, Fredrick!"
Fredrick looked at the fish, shrugged, and replied, "I’m just trying to lose a few pounds... by gaining more pounds!" 
The fish rolled its eyes and swam away, while Fredrick settled back onto his rock, smugly proud of his plumpness. After all, being a fat frog was *ribbiting* good fun!