World War One started in 1914, two years after Mr. Birling called the idea of war “fiddle sticks,” which is a good example of what is known as dramatic irony. Dramatic irony is when the audience knows something that the characters don't. Another good example of dramatic irony is where Mr. Birling describes an exciting new ship that's just been built as “unsinkable.” And that ship would go on to be the Titanic, which of course would go on to sink in the spring of 1912, on a voyage between the United Kingdom and New York.