What is the most useless knowledge/fact you have/know?

From story of an hour Why is Richard so conserned about bearing the sad messages to miss mallard himself? Who was waiting on Scrooge in the next room? What is the conflict of pyramus and thisbe? Did Alice and Jasper get married before or after they met the Cullens? Reaction in the story romeo and Juliet story? Where did gatsby and daisy disappear to during the party? What has the author Larry Ross written? How old are you when you turn an adult? Where can you buy Condolences book? What town and school does the book crackback take place? What does the phrase Readers create Meaning mean? Differences between New Criticism and the Russian Formalism? What has the author Wilford Merton Aikin written? Is Hermine Granger a protagonist? What is the view of marriage that it suggests in Pride and Prejudice In what ways is the conversation between Mr and Mrs Bennet in chapter one a commentary on this sentence Do you think Mr Bennet? In fruits basket does kyo ever win against yuki? What is a rule of thumb? What was the most interesting incident of the story three men in a boat? Who is Joe Donahue the author of the book Urgent? Is there a website with the static shock comic?

What is the most useless knowledge/fact you have/know?