The Sentence Game
The Sentence Game on Ice - picture by Evang-y1203
As mentioned by bean in game 5019 TheSentenceGame is itself a strong meme.
The Sentence Game is usually represented by the logo on the front page, the "angry face -> penguin + toilet" drawing. It is sometimes used to represent the site on a computer's monitor, a building of some sort where the Sentence Game is held, or on posters at Sentence Game events of some sort. There are often "meetings" the popular characters hold which occur at the supposed Sentence Game events or buildings.
The sentence game is also one of the earliest known memes, appearing in Game 21. Ironically, that game mentions another potential meme character: Kaiser Penguin. This character's name was written within one of the drawings.
Games with TheSentenceGame