tricked into doing/or believing what though?
i think there will always be bartering/trading, when the financial crisis just happened over in Greece and so many people couldn't access their bank accounts, many of them resorted to bartering and they even created their own currency in their community there, at least I sure hope that there will always be competition/more than 1 option
That's the important thing in my opinion, make sure other options remain available.
I agree there will always be physical barter, unless perhaps we get to some kind of INSANE futuristic world like Brave New World or something.
However, already, it seems like the internet is a such a powerful place, if you really wanna get your stuff out there or buy certain things, sometimes the internet is the only option.
Oh and to answer your question.. I guess being tricked into participating in a system that their enemy controls or whatever..
There already are over 100 of them over at coinmarketcap.com ;)
Though most I wouldnt recommend as new World Currencies.