The highlight of Buffettstock is always Warren’s five-hour, off-the-cuff Q&A session with Berkshire investors at Omaha’s CenturyLink Arena, and this year was no different. The Berkshire chief and sidekick Charlie Munger ranged over a variety of topics for 38,000 adoring fans, including: Did they fuck up, re: Coke? Should a 59-year-old volunteer sheriff and college…