I like learning random words and phrases.

Chuu troute kudasai? (Can I please have a kiss?)

That comes in useful xD

Here's a few good sites for learning random things anyway.

http://www.geocities.com/malla_tobuc...nese_List.html

http://www.thejapanesepage.com/love.htm

http://www.cnfj.navy.mil/phrases.html

You pick up random stuff from watching films and anime a lot too. But I would imagine it would be very hard to learn the whole language and how to speak it.