Sent To The Printers Too Soon
In the 2016 United States presidential election, the magazine Newsweek printed a special edition with the title "Madam President" (with Clinton's face on the cover) and sent them to stores. Following Donald Trump's upset victory, they had to recall those copies.
In 1948, the Chicago Daily Tribune printed nearly 150,000 papers with the erroneous headline, "Dewey Defeats Truman"1 . Needless to say, Dewey didn't win the presidential election.