Just 'cuz I like ya, Tex, I'm gonna let you in on my secret.
Fish get conditioned.
They are far more aware of our presence than we give them credit for.
They learn to time our casts, and don't eat stuff floating by right after we cast our fly (flies) into their feeding lane.
I keep 'em confused.
"Watch out, everyone. A fisherman just arrived. Here he goes, now. False cast. False cast. False cast. Again..."
"I think he actually cast that time; don't eat!"
"You sure?"
"Nope. Here he goes again. False cast. False cast. False cast. False cast. Again....again...again..."
"Damnitall, I'm hungry. Here comes a big juicy hopper, & a stonefly nymph, and a big ol' worm. I'm gettin' 'em before someone else does!!!"
"Noooooooooooo!!!!"
Easy-peasy, lemon-squeezy!