One of Life's Puzzles

Don't know why T'wasn't thought of before When I realized it I was totally floored I'm sure you must know What I'm referring to Not the meaning of life Or why oceans are blue Put your thinking cap on I'll give you a clue To do with some caramel It's making me drool It's made by Cadbury's Called a Caramilk bar I'm sure you've had one The yummiest by far Don't know their secret Like magic methinks Some spying if I try Could land in the clink Guess it's a puzzle We'll take to our grave Come back with the answer Coz ghosts misbehave They can spy on things Without being seen Then the secret will out That'll be kinda keen Then old Mother Earth Will no longer ponder We'll all catch our breath At last know the answer