What advertising/marketing tricks have you fallen for?

Some fancy advertising. We got those Eggies “hard boil your egg in these plastic shells”, and while in theory they worked, they didn’t seal tight and it took like 45 minutes to get them hard boiled. The concept was good, wish they can improve, but the results left much to be desired.

On the other hand, Miracle Thaw worked far better than expected and we use ours nearly daily.