The beer Carling Black Label was specifically NOT advertised because It was determined that's what drew the customers to the product

Edit: I should clarify that over the years it has been variously advertised and not advertised. I was referring to a specific period in Canada. But then like all things, different brand managers take over, strategies change, and they went back to advertising it. They lost a lot of the customers that appreciated the fact that it wasn't advertised, but they gained manyfold more.