Goes back to our basic instinct I reckon, Nath.....
I agree with both Brian's 'fishy smell' concept and the 'gut feel' concept.
Often when we are sounding out some new territory to fish Kyle will say "Hey Dad, I want to try this area for a while" even though there is nothing on the sounder and no bait or bird activity. About 4 times out of 5 something happens, not necessarily a barra, but something.....
Similarly we will pull up to one of our favourite spots and he will look around and say "Doesn't feel right today, Dad". I will persist and, of course, we strike out!
He is truly the chosen one........