Akalistos said:
Why do you think that learning a fake language is the equivalent to being crazy? Seriously, it's just a hobby that some people do because they enjoy the universe. It isn't a job, it's a hobby. And what's so weird about that hobby? Most fake languages were articulately crafted just for the purpose of learning. Sindarin, Klingon, and Smurf languages were meant to be learned, you never see the entire language in the shows, movies, or books. People learn it because they love the universe and want to know more about it.
Don't tell me you've never found something interesting and wanted to look more into it. Besides, you said yourself that you don't know anyone who would have this as their hobby, so what gives you the right to say they're crazy? Also, the Smurf thing is a nickname, no need to get so worked up over it. (And please use spell check next time)