I never thought they did, but I just saw a picture of a "Triple Chocolate Meltdown" (that's what they call it at a certain restaurant), and now I'm wanting one. I'm not having one, but I want it. That's an ad that works.
Yes they do. They're designed with the use of algorithms. 64,200 repetitions make a lie into a truth. Another reason why TV is the primary tool used to socially engineer the general population, as do ads.
Never. Except for those Viagra commercials where the old goats always have a young hottie jumping them. That makes me want to spend $30 for a 50 cent pill. Snark!