[yoonminn]

I combed through the paper and found this paragraph for you guys, the organization only answered two Klingon ones correctly:

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Finally, the results for ImageToText are impressive. Relative to the other services, ImageToText has appre- ciable accuracy across a remarkable range of languages, including languages where none of the other services had few if any correct solutions (Dutch, Korean, Viet- namese, Greek, Arabic) and even two correct solutions of CAPTCHAs in Klingon. Either ImageToText recruits a truly international workforce, or the workers were able to identify the CAPTCHA construction and learn the correct answers. ImageToText is the most expensive service by a wide margin, but clearly has a dynamic and adaptive labor pool.