A blog that I follow had this example of a clever advertisement. Generally we tend to get annoyed by advertisements as they appear everywhere and interrupt what we may be doing. This is an ad that has something going for it. I find it quite clever. Mind you, I am also a very keen milk drinker.
For all you cat lovers out there.
Gippsland Granny 
Made me smile! I have a cat who can tell when I get the milk jug out of the frig and comes running and meowing!
Cats are cleverer than most people think they are.