The folks over at the Journal of Irreproducible Results have come up with another winner!
Click on the graph for embiggerment.
Links to the runner-ups can be found at http://www.jir.com/graph_contest/index.html#OneGraph.
Update: After posting this, I realized that this was several years old but decided that it did not matter. Since this is the graph that proves all theories, it works now, i.e., in the future from then, just as well as it would if it had been discovered yesterday.