Goldbob's Guide is an item in Paper Mario: The Thousand-Year Door.
When Mario finds Goldbob in Poshley Heights, Goldbob will give Mario permission to use Fahr Outpost's cannon. However, for Mario to receive this guide, he must give Goldbob all of his money. If Mario confirms multiple times to pay all of his coins for the guide, Goldbob will give him this guide, but decides to give Mario his coins back. This guide is clearly the guide to a Bob-omb Cannon.