Chris Broad of "Abroad in Japan" (subscribe to his YouTube channel) shares a Japanese educational book titled 正しいFUCKの使い方 (How to Use "Fuck" Correctly), which explains to Japanese speakers how to swear correctly in English. He shot video of various people in Japan encountering the lessons for the first time, and the result was pretty funny. NSFW language, if you work in a place that doesn't take kindly to cusswords.
[Video Link, via Joe Sabia]