Rules are simple:
on your first post here, You post:
"Hello! I am" (don't write everything after it.)
Then, Every time you visit the forums, you add a word to the sentese, for example:
"Hello! I am"
"Hello! I am a"
"Hello! I am a blue"
"Hello! I am a blue donaught"...
and you just keep going, so eventually we will end up with things like:

Let the games begin!