"The aim of Watson and Rayner was to condition a phobia in an emotionally stable child."

There's a documentary called "Manufacturing Consent" that is an interesting look at the PR and advertising industry that goes into the psychology of it.

Though some of them have no subtlety. Even as a teenager, I remember noticing the insidiousness of minivan adverts. They weren't selling vehicles, they were selling the idea that a new vehicle will make your kids want to spend time with the family again. It was probably because I was a teenager at the time that I noticed it because I thought minivans were lame and knew I'd resent having to go for family rides just because we got a new vehicle that I thought was dumb anyways.

But these advertisements wanted to convince families to spend money they may or may not have been able to afford for an emotional result that was at best going to be short term even if your kids had undergone enough brain trauma to get excited by minivans. Eventually the novelty would wear off and they'd want to go back to eating paint chips or doing whatever kids who think minivans are cool like to do. And then the lonely parents are stuck with a vehicle that reminds them of the thing that made them sad and have a new incentive to get a new vehicle to help them forget about it.