  We study the contribution of spectator massive scalar fields to the
inflationary density perturbations through the universal gravitational
coupling. We find that such contribution has several remarkable properties: it
does not decrease as the mass of the spectator field increases; it has a
significant size and cannot be turned off by any adjustable parameters; and it
applies to all massive scalars existed during inflation, making the overall
effect unexpectedly large. As a result, the primordial density perturbations
are anomalously sensitive to the high energy physics.
