Which marketing strategy have failed you?

[Heatman]

Marketing is a very important aspect in any business because this is what is going to help you to reach out to your potential customers who would patronize your products and services if it is exactly what they are looking for. 

There are so many marketing strategies that are there for businesses to make use of in order to reach their customers but it is not a guarantee that each of these marketing strategies used will be successful.

Which of those marketing strategy that you have used that failed completely?