With the pressure to demonstrate marketing ROI steadily escalating, Chipotle and Turner Broadcasting System have set a new standard in post-campaign ROI measurement, conducting a pilot in which the media firm guaranteed a sales lift from the quick service restaurant's ads on its TV networks. This sounds like a major advance for advertising accountability, but beware of the downsides of focusing TV advertising solely on short-term metrics. B2C marketers should read this report to learn from this campaign and plan their own tests of video buys that guarantee sales.