(How do you explain to an innocent citizen of the free world the importance of a credit default swap on a double-A tranche of a subprime-backed collateralized debt obligation? He tried, but his English in-laws just looked at him strangely. They understood that someone else had just lost a great deal of money and Ben had just made a great deal of money, but never got much past that. I can't really talk to them about it, he says. They're English.)