I have read and heard about use cases. I would like to see some real world examples. Nifty images would be nice, but impractable to post. I hear that text based ones are also common, and those could be posted.

So, could everyone who has some please post a bunch? Don't worry about weather or not I fully understand them out of context. I think it will help me regardless, especially if I can see some from multiple people/projects.

Thanks.