A psychology experiment for you to do:
FIRST, watch this (approximately ten-minute-long) video, about which BoingBoing says “India’s most expensive movie yields most astonishingly violent and demented action-scene in cinematic history”:
THEN, ask yourself “Did you see the gorilla?”
[If that seems a nonsense question, then see the Dan Simons / Chris Chabris experiment. Then all will become clear to you, or at least should become clear. And you will know something nifty about human behavior.]
[PS. Unless you have a vivid imagination that often conjures up gorillas, the answer to that question ought to be NO. If you do have a vivid imagination that often conjures up gorillas, good luck to you.]