Of Men and Mice... "*

Just like if you look only one way on University Street or both ways before crossing against the light, what you call this separates the men from the mice.

Because it may be called a slide other places in the world, but here, at the center of the Universe, we call it a sliding pond.

*and now for the joke
MAN ONE: Are you a man or a mouse?
MAN TWO: Put a piece of cheese down and find out!