Do you have some time to kill? Do you like trivia? If so, then you should check out Sporcle. The site describes itself in this way:
Founded in early 2007, Sporcle came to life with the response to its first quiz, naming the U.S. Presidents. As avid crossword, Jeopardy! and trivia fans, we created that original quiz not only to test knowledge, but also as a way to learn a piece of information that seemed to come up again and again.
Since then, Sporcle has continued to create quizzes for entertainment, memory and diversion (don’t worry, we won’t tell your boss). You can play one of the thousands of quizzes (and increasing daily) or make your own!