Just for a fun challenge, I decided to learn to count to 10 in 10 languages, besides English. In most languages, if you know 1-10, you can say just about any number. Eleven, for example, being 'ten-one', literally.
I've also learned a few greetings: 'hello', 'goodbye', 'please', 'thank you' and 'sorry' in each language.
Now I have accomplished this in:
French, Spanish, Greek, German, Italian, Russian
Chinese, Korean, Arabic, Japanese
(Originally, I had planned to learn 20 languages, but I have decided that 10 is enough, for now.)