As the Kansas City Royals and Toronto Blue Jays continue their battle in the American League championship series, the libraries for both cities have had a war of words on Twitter. It's very clever and very funny, and probably the coolest these librarians have looked in their entire lives. It's also the first time libraries have become so heavily involved in sports. Normally it's the mayors of the respective cities promising each other their city's best delicacy over a dumb bet. But the libraries are using book titles in stacks to taunt each other, and they're doing a great job. KC kicked it off after their last win:

Sources: Twitter