I see dumb people
A famous quote from the movie "The seventh sense." The plot of the movie revolves around a disturbed boy who tells his counselor, "I see dumb people... and they don't even know they're dumb." In the end, the counselor goes back to his home and finds that he is one of the dumb people the boy was speaking of. 
I see dumb people... and they don't even know they're dumb!