The “Oxford comma” is the one placed before an “and” in a list of three or more. It’s the subject of an embittered battle among grammar-lovers. You can make up your own mind. Sometimes it’s correct to use it; sometimes it’s more fun not to.

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Posted at Mental Floss, made by Arika Okrent, who wrote a book about invented languages, and artist Mike Rogalski. Used with permission.

Lisa Wade, PhD is a professor at Occidental College. She is the author of American Hookup, a book about college sexual culture, and a textbook about gender. You can follow her on Twitter, Facebook, and Instagram.