Depends if you really care about the person realising the truth, because selfishly you'd want Bitcoin to stay cheaper for longer. Also, simply sending Bitcoin with no further explanation might lead them to just go the speculative investment route.

Having said that, I think the easiest way is to explain the history of money, and describe the social constructs behind fiat and gold. When all that is put into perspective, it's much easier to see Bitcoin as an evolution of the money standard.

When the doubt in the current system is planted, they should naturally start researching themselves more, and hopefully buy it for the right reasons.