Gates, Buffett dress up as King Arthur, Merlin on Halloween 
Microsoft Co-founder Bill Gates and Berkshire Hathaway's CEO Warren Buffett dressed up as King Arthur and Merlin respectively, on Halloween. "Happy Halloween from King Arthur and Merlin! I can always count on Warren to put together a good costume," Gates said in an Instagram post. Halloween, observed on October 31, is celebrated to remember the dead, including saints and martyrs. 