Cramer's 'Mad Money' Recap: Hoosier Daddy

Cummins, said Cramer, has a story that can teach market-players "the single most important lesson" about stocks: "Wall Street is often, if not always, wrong." If people don't do their own homework, they're going to miss out on "way too many opportunities," he said.

Cramer called Cummins the "perfect local company" for home-gamers to invest in. Big investment banks don't send their analysts to Columbus, Ind., to check up on things as much as the locals could, he said.

"It was a stock no one believed in, but the money men were wrong," Cramer said. They expected a bad performance from the company this year and "sadly and stupidly," Cramer believed them. And the worst part is that at least the money men came to their own conclusions, but he listened to someone else's bad advice.

The Street believed that weak truck sales would mean weak engine sales for Cummins. While this turned out to be true in the U.S., sales from the rest of the world "saved" the company, Cramer said.

Right now, the stock's ratings are five sells, five holds and one buy, he said. "It has beat the Street too many times, don't let it beat you," Cramer advised. "This one should go up much, much higher."