Why's (poignant) Guide to Ruby, sometimes called W(p)GtR or just "the poignant guide", is an introductory book to the Ruby programming language, written by why the lucky stiff. The book is distributed under Creative Commons Attribution-ShareAlike license. The book is published in HTML and PDF formats. Chapter three was reprinted in The Best Software Writing I: Selected and Introduced by Joel Spolsky (Apress, 2005).