Haven't seen a thread like this yet. I've seen this game before on other forums, and thought it would be fun here.
In this game, we'll start out with a story. The next person changes, removes, or adds a word. Words like it, and, or, is, a, if, as, etc. don't count as words - you can remove or add them if they're next to the word you're adding. You can also add (or remove) any punctuation you feel is needed. Here's an example:
The three green bettas had three tanks.
The three green aliens had three tanks.
The three green aliens had three UFOs.
The planet of green aliens had three UFOs
The planet of green aliens had three UFOs and traveled
The planet of green aliens had three UFOs and traveled to Earth.
The betta liked swimming