It's a shot in the dark, but here I go!

Bitcoin. Like the US dollar or the Japanese yen, but completely online.
Or
Notice how everything has been getting a lot more expensive lately? Not if you're using bitcoin, the currency that lives on the internet!

I find that a lot of people don't understand anything about money or where it really comes from. Trying to tell them about decentralization and middlemen is a waste of time! It has to be about the convenience, ease of use, and security!!!