When life gives you lemons people say that you should make lemonade and drink. I say, do a bit more than that. Collect the seeds and sow them in soil, care about them and wait for the lemon plant. Then you'll get thousands of lemons, do the same with other lemons, now you have millions of lemons. Then you can start some crappy lemonade chain like, "XYZ Lemonade". On top of this financial gain you can now officially give lemons to other people. When others follow your trend your lemons will be found in almost every corner of the world. You can then officially propose your lemons to be introduced as the currency of the world. Ever wondered?