japanese (to be able to play JP only games) or german (To gain the ability to yell "NEIN" like a native).
edit: Like some people already said, due to the similarities, german might be quite simple to learn. the only pain might be learning the german articles ~
The definite articles in German refer to specific persons, objects, ideas…etc. and they are : der, die, das, die (plural) they all mean the expression “the” in English, der is used for masculine nouns, die is used for feminine nouns, das is used for neuter nouns, and finally die used also for plural nouns.
( http://german.speak7.com/german_articles.htm )
funfact: pretty much every game console except for the Gamecube, N64, NES and SNES (if i recall correctly that is) do have the feminine article, "die". (Yes, its written as "to die") while the 4 Nintendo consoles mentioned have the masculine "der". (except for if you spell it out, the word "system" turns the nes and snes into neutral words, and are therefore not masculine anymore. :P) But yeah, in a nutshell nintendo is DA MAN (except for the wii, she's a her :P), while sony and microsoft only have girly machines. 
I'm a Foreigner, and as such, i am grateful for everyone pointing out any mistakes in my english posted above - only this way i'll be able to improve. thank you!
