The CDF collaboration has reported a large deviation from the standard model of the t-tbar forward-backward asymmetry in the high invariant mass region. We interpret this measurement as coming from new physics at a heavy scale Lambda, and perform a model-independent analysis up to order 1/Lambda^4. We find that a large asymmetry can only be accommodated by heavy new physics that interfere with the standard model. In addition, the new physics induces a minimal enhancement of boosted jets. We show that a smoking gun test for the heavy new physics hypothesis is a significant deviation from the standart model predication for t-tbar differential cross section at large invariant mass.