  Quarks and leptons may be related to each other through a spontaneously
broken discrete symmetry. Models with acceptable and interesting collider
phenomenology have been constructed which incorporate this idea. However, the
standard Hot Big Bang model of cosmology is generally considered to eschew
spontaneously broken discrete symmetries because they often lead to the
formation of unacceptably massive domain walls. We point out that there are a
number of plausible quark-lepton symmetric models which do not produce
cosmologically troublesome domain walls. We also raise what we think are some
interesting questions concerning anomalous discrete symmetries.
