  We consider contributions to non-Gaussianity of the Cosmic Microwave
Background (CMB) from remnants of post-inflationary phase transitions in the
very early universe. Such signatures can optimistically be used to discover
evidence of new particle physics through cosmological observations. More
conservatively they provide a potential obstacle to extracting information
about the non-Gaussian nature of primordial density fluctuations from any
detection in the CMB. We demonstrate this explicitly by computing the
bispectrum from global textures, which may be generated from a wide class of
particle physics models.
