Just show them the real money behind bitcoins and voila! 
It is about the paper and cards for them to see what can bitcoins do 
The bitcoin is easy to show and they will trust the bitcoin now, the price of the bitcoin is increasing more and more, holding the bitcoin and the value of the bitcoin will be high in the future, the users of the bitcoin are getting the income to the high stage and it is very important to encourage the people to use the bitcoin and to promote the bitcoin to the huge circle of our present society and the businessmen of the society. It is about the paper and cards for them to see what can bitcoins do