Sometimes a business opportunity thunders into your life when you're not expecting it. Circumstances such as a corporate downsizing that leaves you jobless may place you in the position to consider starting a business. Or perhaps you have created a unique and exciting product and want to find a way to bring it to market. Maybe a close friend or colleague taps you on the shoulder and asks you to join her in a business endeavor. Sometimes all the planning in the world yields nothing, and then when you least expect it, opportunity knocks.