Darrell Huff had a witty explanation of how you can change the impression a graph gives by playing around with the scale and range of the y-axis, but even in a book called How to Lie with Statistics he never even considered changing just part of the scale of an axis. Of course, Huff was limited by the fact that his book was based on real statistical lies and screw-ups that he had found in the popular press as of the early Fifties. He also tried to limit himself to lies that were at least true in some technical sense. There was no way he could have anticipated Fox News.
The catch comes from Media Matters via Mark Thoma.
Here is the same graph with vertical lines for full comic effect.
Go ahead, measure them for yourself. It's fun.
In all fairness to Fox, the period from September '08 to March '09 did feel like a long time.
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