We're going to create a really long sentence, one word at a time.
Example
Post 1:
I
Post 2: saw
Post 3: six
Post 4: red
post 5: turtles
and so on.
You can't use any full stops, and you can't use more than one word, even if all you get to say is "and," or "it," for example.
I'll start us off:
Yesterday