Broad has appointed himself a "swearing missionary," spreading not the Good Word but all the bad ones, inspired by How to Use Fuck Correctly: 99 Phrases Using Fuck, Shit, Damn, and Hell that Schools Won’t Teach You that Should be Used with Care by Madsaki, released earlier this year in Japan. Reviewed in depth by Japansubculture, its contents demonstrate everything from convincing expletives to navigating confusing homographs such as the phrase "Oh, for fuck's sake."
For those uncertain of navigating Amazon Japan, the book can be ordered in America from Yesasia with a modest markup. At Kotaku, Brian Ashcraft reports that it provides detailed explanations and useful illustrations that help with context: "Which looks more enjoyable? The book that tells you how to say, 'I brush my teeth' or the one that teaches, 'fuck off?'"