Klingons are one of the alien races in the Star Trek universe and in 1984, American linguist Marc Okrand invented a language for them. The language consists of 3000 words and it is estimated that between 30 and 200 nerds from around the world are fluent in the language.
One such nerd is Andre Muller, who also happens to speak a dozen real languages. He is 32 years old and is studying towards his PhD in linguistics (go figure) at Zurich University. He also teaches Klingon at the Migros Club School, which is the largest adult education institution in Germany.
Apparently, interest in the course exploded after the school had a booth at Switzerlandès comic convention. That is some smart advertizing!