An idea for an advertisement for Kit Kat ChunKy:
An ordinary looking engineer sits at his desk and works with a computer. Then he goes to a candy vending machine and sees a Kit Kat ChunKy inside. He buys one. He looks around, and buys another one. And more and more until his money runs out. He goes back to his desk and puts them all in his drawer. Later (show a clock or something) he eats one. In the middle of it he cries. Fade out. That's it, no tagline is necessary.
That's just what happened to me today.