On 1 April 1998 the Burger King company released an advertisement for a new hamburger called the 'Left-Handed Whopper'. The advertisement said that the new hamburger had the same ingredients as a regular Whopper, but that the Left-Handed Whopper was a special burger for left-handed people. Thousands of people went into Burger king restaurants to ask for the Left-Handed Whopper. They didn't know that it was an April Fool's Day joke.