The Nice Boat meme is notable in that it was created in 4chan and adopted wholesale by 2chan.
It's so much fun to troll the ANN forums whenever School Days comes up, just say "Nice boat came from 4chan" and watch the neckbeards say "NO THAT IS NOT TRUE SIR, you are mistaken, indeed it came from Ni Channeru, or Futaba Channel for the romanji-inclined."