The corporate world treats being "data-driven" as the ultimate holy grail, often taking Peter Drucker's quote "What gets measured gets managed" as absolute truth. But what happens when we blindly follow dashboards? This session is a reality check on our obsession with metrics. We will explore how human nature causes us to systematically overlook subtractive changes and how Goodhart's Law proves that "when a measure becomes a target, it ceases to be a good measure". From the Volkswagen emissions scandal to the dangers of p-hacking and torturing data until it "confesses" , we will uncover why pure data-driven approaches can lead us astray and why true insight requires a subtle balance of metrics.