As Trafton said. Someone probably made a program (which is fairly easy to make) that joins a server and then leaves it leaving a message behind in the chat. If you're wondering why there is no "joined/left the game" text at the end that's because it's easy to hide it by just changing the letter spacing and move it off screen. The message probably appears twice. If spazzyman really made it why would he put his name in it anyway?