Personally, unless your CV is really thin and you need something to pad it with I wouldn't do it. It's just going to look unprofessional and make you look like a less serious candidate. If you feel you must include it then add it to hobbies/interests, your wasting your time talking to an interviewer about a hobby language. Now if they bring something like that up with you, that's a different story.
Darkheart
Darkheart