I got this Idea from the FFVIII forums. I didn't bother looking through all the threads, so if a game like this already exists, just ignore this.
Well the way this game works is, one person starts with a word and then the next person says a word that starts with the last letter of the word before. All words have to do with FFX. (example: Jecht-Tidus- Sin-etc.)
I will start with: Fiend