We examine S&P 500 firms over 1999–2014 that characterize their annual performance with extreme positive language. Only 18% of such firms increase shareholder value, while over 80% have either negative or insignificant abnormal returns. Our evidence suggests that firms often base their claims of extreme positive performance on high raw returns or strong relative accounting performance. In comparison to firms that generate positive abnormal returns without boasting, our sample firms tend to have superior accounting performance. We conclude that boasting about performance is rarely associated with value creation and is more consistent with an emphasis on accounting metrics.