I had a yellow coris that used to fight his reflection on the surface of the water whenever I was doing stuff with the pumps off... went berserk every... single... time... LOL
My watchman tends to just stare at food hitting him in the head, eventually he eats but normally it takes a few bits of food hitting him before he realizes he can actually eat the stuff
I have a tank full of geniuses! Although my Swallowtail Angelfish did leap to the carpet chasing food once. 4 1/2 feet to the floor, put her back and she didn't miss a beat, just kept eating.