Yoshi Cloud

The Bonus Cloud is an object that appears in Super Mario World. It resembles a little Lakitu's Cloud, complete with a smiling face.

Super Mario World
When Yoshi eats two Pink Berries, he will hatch an egg with a Bonus Cloud inside. The cloud then hovers above Mario and pops out ten Bonus Coins, after which it flies away. If Mario manages to collect all ten Bonus Coins, he is rewarded with a 1-Up Mushroom.

Super Mario-kun
In chapter 8 of volume 2, while fighting a Jumping Pumpkin Plant, Mario falls on Yoshi, making him pop out an egg. Inside, a Bonus Cloud appears. Mario jumps on it and eats the Bonus Coins, becoming the big-headed Nikoniko Mario, scaring off the enemy.