When a famous person uses your product in an amazing way, it’s time to advertise it big. This is how advertising and word of mouth work together.
Example: It’s time to buy a Times Square billboard when the President wears your jacket to visit the Great Wall of China.
This sort of endorsement is what I call implied endorsement. The person didn’t set out to give you a testimonial, but they did by using your product in a way that shows how much they like it.
When it happens to you, make sure everyone knows!