Yes. The best laid plans some times just crumble like a cookie. Vanish in smoke right before your eyes. What to do? Be nimble, quick on your feet, willing to have a re-think. Why not? No worries. You loved an idea? Oh well, try another one. Closed door? Instead of beating your head against it, you can alter your course, find another opening somewhere else. Yes. Be like water. Or be like a serpent. "Serpentine! Serpentine!" Move on. Move forward, backward, sideways too. Whatever.