I'm posting this because, I know, there are many stupid people who try to use these two methods (feel free to add more that don't work...or do).
1. "T A L K I N G L I K E T H I S". The other people DO NOT see the words how you typed them. Each letter is changed into a different letter (see other guides/websites to see which letter changes into what.)
2. "/e sez u r n00bzors." This translates to the hordies: "(Your name) makes some strange gestures."
So please....do not do any of the above when trying to talk to enemies, you'll only look stupid to them.