Naruto: The village was on the verge of bankruptcy, and I struck oil.

This book is also known as "The Unscientific Ninja Tool Master of Sunagakure".
"Gaara, good luck!" "If they find oil, Sunagakure will be rich." Gaara was utterly bewildered. He was indignant.
Teacher Mufeng, shouldn't hard work be about diligent cultivation? You keep telling me to dig sand, what kind of cultivation is that, looking for oil?
"Scientifically speaking, digging in the sand is a very good form of exercise."
"Just keep digging. If you happen to find oil, everyone in our Sand Village will be able to wear a white cloth on their head, and I'll be the richest person in the world."