There’s no feeling in the world quite like the feeling of discovering a life-changing job post. There you are, scrolling through job boards with your eyes glazing over, skimming post after post of not-quite right positions that may or may not be tolerable, attainable, or within commuting distance, when all once it happens. You read the first few lines and your heart starts to flutter. You start looking for a catch, certain that this opportunity is too perfect to be real.You reach the end and start again from the top, and as you do, your hopes begin to rise into the sky. The moment may also happen during a conversation at an otherwise dull networking event. Or during a chance encounter in a waiting room or on an elevator. No matter where or how it happens, it’s like the first few seconds of true love. What you do during the next few seconds may control your destiny. Here’s how to respond.