Reminds me of my favorite ad of all time.
(note, the ad is not a cartoon - it is "real-life" filmed in what looks like a NY convenience store)
Scene: a Dingy, big city convenience store. Old lady at the cash register notices a young guy (early 20s or so) enter with his hands in his pockets and a shifty look in his eyes.
The cashier is helping one customer and the young guy looks around to make sure no one is watching. He then grabs (somewhat indiscriminately, 5 boxes of cereal in one armful). The cashier hears the bell on the door and looks up to see the door shut, the store empty, and the money for the cereal boxes sitting on the counter, one coin still spinning.
We then follow the young guy as he ducks into a seedy looking apartment complex and runs up a dimly lit staircase to an apartment. He steps in, shuts the door, and leans with his back on the door and grins. He then runs over to the table, picks out the one box of Trix cereal and dumps the others on the floor. Sitting in his run-down, dimly lit kitchen, he pours himself a huge bowl of cereal. He then reaches behind his head and unzips an up-to-now unseen zipper, revealing that the young guy was a "suit" and underneath is the cartoon Trix Rabbit (they now were combining the cartoon rabbit with the real backgrounds a la "Roger Rabbit"

. The Trix Rabbit lets out a joyful laugh and gleefully grabs the milk carton. He goes to pour milk onto the Trix only to find one measly drop of milk left. Horrified, he lets out a screaming "Noooooooooooo......." as the screen cuts to all black with the words:
"Got Milk?"
Brilliant ad. It was a Got Milk ad that they had obviously gotten Kellogg?s to buy in on / help out with. One of the best ads ever.