A scientist friend describes a supermarket trip at age seven, where he saw a packet that advertised Imitation raspberry flavour.
“That means it’s not raspberry, ” he said to  his mother. “Why do they say what it isn’t, instead of saying what it is?”
His mother replied, “They probably tried This is made from coal but we think you’ll like it, and nobody bought any.”
And that, says my friend, is the moment he first understood the nature of advertising.