  Although the prospect is more plausible than it might appear, the answer to
the title question is, unfortunately, "probably not." Quantum fluctuations of
vacuum energy can focus light, and while the effect is tiny, the distribution
of fluctuations is highly non-Gaussian, offering hope that relatively rare
"large" fluctuations might be observable. I show that although gravitational
microlensing by such fluctuations become important at scales much larger than
the Planck length, the possibility of direct observation remains remote,
although there is a small chance that cumulative effects over cosmological
distances might be detectable. The effect is sensitive to the size of the
Planck scale, however, and could offer a new test of TeV-scale gravity.
