“Shaken, Not Stirred!”

James Bond always takes his vodka martini shaken and never stirred. So far, he’s ordered this drink 28 times in all the movies together. And he always warns the bartender: “Shaken, not stirred!” Why is he doing this? Is there a special reason for this, or is it just some kind of trademark? Fortunately, the recipe for the original secret agent cocktail can be found in Ian Fleming’s 1953 novel Casino Royale: