In Captcha it gives you one word you have to get correct, and the other word is for helping scanning in books (where the text-recognition software is struggling). In some cases it's really obvious which word is which (hence one will look like nonsense).
My friend answers the test word correctly and the book word as a rude word, so tomorrow someone will be reading an e-book and it will say something like "He abruptly placed the penismobile on the counter."
