If just explaining bitcoin like fiat money proves it to be unremarkable then they won't be interested in bitcoin, there's no easy way to explain bitcoin to people. Bitcoin is essentially virtual with no physical form and you only briefly explain it, which makes it all the more suspicious. The best way is to give them basic material about bitcoin and ask them to spend time learning about bitcoin. Only then will they see the awesomeness of bitcoin and will decide to participate or not?
I think it would be possible to teach people by comparing it to fiat, if only you could put the differences in there. Assume like this "USA has dollars, UK has pounds, Europe has euro, china has yuan and bitcoin is the digital version of it" that's what I enjoyed when I first saw it.
We all got together as people, and people created their own currency, it wasn't satoshi or whatever that made it what it is, they just founded it, but we took over after him and we made it into what it is today, and because of this, it is peoples money and not governments money. It is digital, it's online, and it's ours, not governments and it's decentralized, so nobody has any control over it at all.