All of those English comments on Overseas Utau videos.
I understand when it's the Japanese attempting to communicate, but it's pretty annoying when all I see on a video is
"omg i <3 u!!!!"
"lol awesum dood!"
"XDDDD go os utau!"
and the like.
It's not that I have something against English users on the website, it's that people post their UTAU videos on YouTube to get comments and critique from English-speakers, and the post their videos on Nico Nico Douga to get comments and critique from Japanese-speakers.
That's all I'm saying.