I notice this a lot on the language board.
The "I JUST STARTED TAKING THIS LANGUAGE AND I KNOW VERY LITTLE OF IT BUT I'LL TEACH YOU HOW TO SPEAK AND WRITE IN IT!!!" boards.
If you don't know the language that well, and you just started taking it, DON'T OFFER TO TEACH IT. You'll probably give very wrong lessons. Mostly people teaching Japanese do this.
On the subject of Japanese: Stop making topics that basically amount to "I LEARNED JAPANESE FROM ANIME! I'LL TEACH YOU JAPANESE!" because I guarantee you everything you will tell me will A, be completely wrong, or B, so informal if you dared to use it when speaking to someone you don't know, you'll offend them.
One girl in my Japanese class learned all her Japanese from Inuyasha and loved to flaunt it. She spoke to the teacher in Japanese she learned from anime, and the teacher told her she was speaking very informally, which when speaking to a superior like a teacher is VERY offensive and insulting.