Is starboard on the left or right side of a boat? How do you say “Japan” in Japanese? What is the character limit for Tweets on Twitter? How long did Sleeping Beauty actually sleep? …I should have known that! is an addictively entertaining trivia game with over 400 questions about things that you should know. In contrast to traditional trivia formats, you don’t receive points for answering questions correctly. Instead, points are subtracted for every incorrect answer! One thing is for sure: it will only be a matter of time before you hear yourself say… Doh!… I should have known that!