Betting markets in everything

Bet on your own grades.  Here is how it began:

One
Sunday afternoon, Steven and I were sharing ideas, and I mentioned to
him that I had an exam the following day and that if I were to study I
was sure to get an A. But I was enjoying my Sunday afternoon, and I
made it clear to him that I had no intention of studying. That’s when,
in order to provide me with motivation, we made the following
agreement: If I got an A on the exam, he would give me $100, and if I
didn’t get an A, I would give him $20. We thought every student would
like this type of motivation, therefore, we established Ultrinsic
Motivator Inc.

I thank Max for the pointer.