The entrepreneurial world is full of eccentric characters with unorthodox habits. These oddities arguably play a large roll in their success. For example, did you know that Nike CEO Mark Parker is a doodler? Parker takes his business notes on one side of a notebook and reserves the other side for his sketches. He says this practice keeps his brain in equilibrium. Inc.com recently posted the infographic below, check it out to see more unusual habits of great leaders.