I ran into someone the other day whom I had never met and who fit the following five criteria:
1. He/she attended the University of Chicago.
2. He/she is still alive.
3. He/she is a whole lot smarter than I am.
4. He/she is a whole lot more famous than I am.
5. He/she is even more controversial/notorious than I am.
There a lot of people who satisfy many of these criteria (especially #2 and #3), but I think the set of folks who satisfy all five of these criteria is not very large.
SuperFreakonomics schwag to the first blog commenter to correctly identify this person.
Addendum: We announce the winner here.