How to Tunnel Out of Prison

How to Tunnel Out of Prison is an instructive book teaching ways to escape prison through digging one's way out. Counterintuitively, the Springfield State Prison has this book among its library selection. When Homer Simpson was jailed thanks to an illegal scheme on the part of Moe, Hans Moleman offered Homer various reading materials. Homer noticed this book and noted that it could be useful, and used it to hit Hans on the head and run away.