When playing age of mythology multiplayer, you can type numbers into chat and the computer will voice a tuant (as in most of the "age of" games).

The tuants go up to thirty five, but if you type in the number 999, it will play a funny song to the tune of the Age of Empires two theme, I'm not 100% what the lyrics are but I think they are saying "This is RTS three" because age of mythology is the third RTS in the series.