USO moves in relation to oil's $50 mark

I say, trends in silly moneymaking funds like USO and UCO, UWTI, etc are a great way to get rich, but as my great grandfather said and his great grandfather before him, "Always know where $50 is."

This chart is meant to show you exactly that in relation to USO.

Why does USO do this funny little contango dance around oil? Why, that's for another post my boy!