You have been "million dollars for juan" -ed or in a situation vaguely simular.
A wealthly eccentric billion million bajilionair will temporarily give you 1 million usd. You have one year to do what ever you want with it. In 12 months roughly you will have to pay the entirety of the money back. ( no need to worry about transaction fees or gift tax, the billionair will cover it).
BUT! you can keep any profit you make with it.
If you are unable to return the 1 mil, it will be extracted via your internal organs.
(Legal sale of human heart is roughtly 800k to 1 mil, also imagine the lender have almost supernatural way of tracking you down, so absconding is impossible.)
What would you do with it? Would you do anything with it?
To you what is the most resonable risk with the money, yet most profitable?