Warren and Charlie and the chocolate factory

FORTUNE -- In response to a formal email about setting up a sit-down interview with Charlie Munger, his assistant simply wrote: "Charlie says to come over tomorrow at 8:30."

It wasn't what I had expected. And it was a bit early for me, being new to Los Angeles traffic and tired from the long previous day of touring the See's Candies plant in L.A. (it was a grueling task, but some intrepid writer had to do it.) Being told to simply show up at Munger's private home in Los Angeles on a Wednesday morning in May felt starkly casual compared to my meeting with Warren Buffett, which would be the next day and had been scheduled far in advance. I would be flying to Omaha for it that night.