National Joke Day August 16, 2019 August 19, 2019 Today is National Joke Day! Here are a few library-themed jokes that you can tell your family and friends. Q: Why did the elephant use her trunk as a bookmark?A: Because then she NOSE where she stopped reading! Q: What kind of books do planets like to read?A: Comet books! Q: What do librarians take fishing?A: Bookworms!