My colleague, Ryan, pointed me to this one (he also told me about the circle-drawing guy).
China has released some stamps to mark the year of the pig. When you scratch the front, they emit an aroma of sweet and sour pork. When you lick the back, it tastes like sweet and sour pork.
Now, if they could only do a nice, fiery Kung Pao Chicken, I'd buy a book of them !!