No.9533507 ViewReplyOriginalReport
Proof that it was 4chan that came up with "Nice Boat," taken from a jap's kimiguru blog:

"Did you watch the final episode of the anime School Days?

... What a nice boat wasn't it! (lol

(For people who don't know: The air of School Days, which included the expression of juvenile murder, was stopped, after the REAL juvenile murder. The image of boat was displayed on TV alternatively.)

Just a day later, influenced by English speaker's comment "Nice Boat.", this word came to be quite popular in otaku community in Japan. What a tight relations beyond language!"