MINNEAPOLIS--(BUSINESS WIRE)--This April, the Dairy Queen® system, a Berkshire Hathaway (NYSE: BRK.A and BRK.B) company, is celebrating its 75th “Fanniversary” by highlighting the legendary brand treasure, the Blizzard® Treat, and asking America to #GetUpsideDown with a Blizzard Treat. When Fans visit their local participating DQ or DQ Grill & Chill® restaurant and order any Blizzard Treat during the month of April, it will be served upside down, or it’s free on their next visit. “Thinking