Challange accepted?

You really have to trust your product for such a challenging advertisement. And, 3M trusts. They have placed the ad at a bus stop. The product is bulletproof glass. 3M says that it can't be broken. And; ''it's that impossible that here we put $3 million in cash inside the glass and if you can break it, it's yours!'' Challange accepted??


Here, the challange is not for the audience. It's obvious that challange is for the competitors.