  We report the discovery of a new ``changing-look'' active galactic nucleus
(CLAGN) event, in the quasar SDSS J162829.17+432948.5 at z=0.2603, identified
through repeat spectroscopy from the fifth Sloan Digital Sky Survey (SDSS-V).
Optical photometry taken during 2020--2021 shows a dramatic dimming of
${\Delta}$g${\approx}$1 mag, followed by a rapid recovery on a timescale of
several months, with the ${\lesssim}$2 month period of rebrightening captured
in new SDSS-V and Las Cumbres Observatory spectroscopy. This is one of the
fastest CLAGN transitions observed to date. Archival observations suggest that
the object experienced a much more gradual dimming over the period of
2011--2013. Our spectroscopy shows that the photometric changes were
accompanied by dramatic variations in the quasar-like continuum and broad-line
emission. The excellent agreement between the pre- and postdip photometric and
spectroscopic appearances of the source, as well as the fact that the dimmest
spectra can be reproduced by applying a single extinction law to the brighter
spectral states, favor a variable line-of-sight obscuration as the driver of
the observed transitions. Such an interpretation faces several theoretical
challenges, and thus an alternative accretion-driven scenario cannot be
excluded. The recent events observed in this quasar highlight the importance of
spectroscopic monitoring of large active galactic nucleus samples on
weeks-to-months timescales, which the SDSS-V is designed to achieve.
