I personally tell them about the decentralized nature and the lack of a middle man in transactions. What would BCT recommend to grab attention?
The decentralized nature is it's biggest selling point. Sadly, though, many people are not that familiar with economics or how the fiat monetary system works so they're not that bothered by it.
They don't give a fuck. I've tried explaining Bitcoin's supossed selling points to the average folk and they only start paying attention by the time I mention it can increase in value and they can win money. Other than that, they don't care because they can do everything that is needed in dollar, and 99% of people aren't wealthy enough to care about diversifying it if we are selling Bitcoin as a storage of value. So unless it becomes widely accepted everywhere and becomes a cool thing to do to pay with Bitcoin and so on.. it's doomed.