u/Anxious_Kale

When I was in elementary/middle school I had this book on grammar that was quite entertaining, and I'm attempting to find it to recommend it to a friend. I remember (my copy, at least) being paperback, with a medium blue cover; I think there was a cartoon cat mascot? It had a title something like "un-grammar" or along the lines of the "for dummies" series. All of my googling has gotten me nowhere.