An Interesting Instrument
The website InTrade.com offers prediction markets for a wide array of possible events: everything from predicting weather to predicting election news. Not only is this an intriguing idea, but volume is low and these markets appear fairly inefficient. Actually they are extremely inefficient, and I have figured out a completely risk-free method for reaping consistent, high returns by exploiting certain inefficiencies. But alas, it is a secret, otherwise you will take my money by buying away all the inefficiencies!

Too late, Adam! I saw the entry before you killed it!
I'll see you on the Forbes 400 list.
Bah, fine. But don't tell anyone, or else they will eat up our profits!
I remember being a member of a site kind of like this a while ago. It seemed to have a larger market, though.