Once upon a time in a lush forest, there were two mischievous monkeys named Max and Millie. They loved swinging from trees and playing pranks on their fellow animals.

One sunny day, Max and Millie stumbled upon a magical mangosteen tree. The tree was filled with delicious, juicy fruits that they had never seen before.

Max and Millie were so excited that they started picking the mangosteen fruits and gobbling them up. They were so busy eating that they didn't notice a voice coming from the tree.

"Hey, monkeys! Stop eating my mangosteens!" said the voice. Startled, Max and Millie looked up to find a wise old tree spirit.

The tree spirit explained that the mangosteen tree was special and could grant wishes. But in order for the monkeys to make a wish, they had to solve a riddle.

The riddle went like this: "What has a heart that doesn't beat, and a key that can't unlock anything?" Max and Millie scratched their heads, wondering how to solve this puzzle.

They swung from tree to tree, asking their friends for help. The wise owl, the nimble squirrel, and the friendly deer all tried to solve the riddle, but none of them could figure it out.

Just when they were starting to lose hope, Max and Millie saw a butterfly fluttering by. They decided to ask the butterfly if it knew the answer to the riddle.

To their surprise, the butterfly smiled and said, "The answer to the riddle is a painting! A painting has a heart that doesn't beat and a key that can't unlock anything!"

Excitedly, Max and Millie rushed back to the mangosteen tree and shouted out their wish. In an instant, the tree granted their wish, and they found themselves floating in the air, laughing and spinning.