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Over the course of three hours on 27 December 2008 we obtained optical(R-band) observations of the blazar S5 0716+714 at a very fast cadence of 10 s.Using several different techniques we find fluctuations with an approximately15-minute quasi-period to be present in the first portion of that data at a > 3sigma confidence level. This is the fastest QPO that has been claimed to beobserved in any blazar at any wavelength. While this data is insufficient tostrongly constrain models for such fluctuations, the presence of such a shorttimescale when the source is not in a very low state seems to favor the actionof turbulence behind a shock in the blazar's relativistic jet.

Quasi-Periodic Oscillations of ~ 15 minutes in the Optical Light Curve of the BL Lac S5 0716+714