I read Neil Gaiman's online journal everyday. He's one of my favorite authors and someone high on my "I really need to meet him before I die" list. (Yes, I actually have a list)
At random times, Neil will post something that's been sent to him or that he's discovered that just makes you have to stop and think.
Here is a link to one of those things:
If you can figure that one out, you're a step ahead of the class.