Sometimes, the angler has to resist the forces of instinct. Here's an example: You make an errant cast, maybe miss the strike of a fish, and you soon find your leader and tippet tangled around the end of your fly rod. So what do you do? You give that rod a few spins and shakes--as if a flick of the wrist will magically untangle the knotted mess. We all do it, even though that's one of the dumbest moves we can make. Honestly, how often does a knot get better, rather than worse, when you try to untie it by shaking the rod? Maybe once in a hundred shakes?