How does the little arrow on your monitor work when you move the mouse? Haven't you ever wondered how it works?
Now, through the miracle of high technology, we can see how it is done. With the aid of a screen magnifying lens the mechanism becomes apparent.
EDIT: The link (below) now points to something new. What you used to get was

The men would move the arrow around in response to your cursor movement, with a bunch of shouting and grunting signifying their effort. If you clicked on it they bent at the knees and then lifted the arrow up.
What they have now at the link I think is more inventive, but not as cute. Maybe the Japanese appreciate this kind of humor more.
Go to:
http://www.1-click.jp/ and click on the man's bottom. There are at least three or four variations of what happens, so try it a few times.
I wonder what he's saying, especially when he gets back to the starting point.