Thinking, making decisions with your gut
There are several examples of huge successes because their founders or originators went with their gut feeling according to this Business 2.0 story:
Fred Smith brushed aside the C he received on the college economics paper in which he outlined his idea for an overnight delivery service. His gut told him it would work anyway. (Besides, the Federal Express (FDX) CEO later explained, "a C was a very good grade for me.") Howard Schultz had his eureka moment in Milan, Italy, when he realized that the leisurely caffeine-and-conversation caffe model would work in the United States too. Market research might have warned him that Americans would never pay $3 for a cup of coffee. But Schultz didn't need research. He just knew he could turn Starbucks (SBUX) into a bigger business, and he began, literally, shaking with excitement.