“Trout aren’t stupid. They might be brainless and lack creativity (a lot like the creators of Gilligan’s Island), but they’re survivors. And they didn’t get that way by offering themselves up as a meal for every predator that wanders by. Which – if you stop to watch most fly fishers on the water – begs the obvious question. Why don’t more fly fishers act like predators?”
This piece on the Trout Underground offers good advice on getting close to a trout, in a fly-fishing way of course.