Warren Buffett called out "gambling" and the dangers of deepfakes in a surprise interview. Carlos Barria / Reuters I was in the room when Warren Buffett unexpectedly sat for an interview on Saturday. He warned of a "gambling mood" in markets during Berkshire Hathaway's annual meeting. The legendary investor also underscored the threat posed by nuclear weapons and deepfakes. I was in the room when Warren Buffett sounded the alarm on "gambling" in markets, nuclear weapons, and deepfakes on Saturday. During Berkshire Hathaway's annual shareholder meeting , the company's chairman and former CEO joined CNBC's Becky Quick backstage for a surprise interview. The pair's conversation was broadcast live to the crowd of thousands seated in the CHI Health Center in Buffett's hometown of Omaha. I had a bird's-eye view of the event from the press box overlooking the stage, and could see the crowd's excitement at the prospect of hearing the business icon speak.…