  I will begin by conjecturing a cosmological generalization of black hole
complementarity (also known as the central dogma). I will then discuss three
theories and argue that they are inconsistent with second law of thermodynamics
if the cosmological version of the dogma is correct. The three theories are:
the big rip; cyclic cosmology; and the Farhi-Guth-Guven mechanism for creating
inflating universes behind black hole horizons.
