  The recent observation of a modest excess in diphoton final states at the
LHC, by both the ATLAS and CMS Collaborations, has sparked off the expected
race among theorists to find the right explanation for this proto-resonance,
assuming that the signal will survive and not prove to be yet another
statistical fluctuation. We carry out a general analysis of this `signal' in
the case of a scalar which couples only to pairs of gluons (for production) and
photons (for diphoton decay modes), and establish that an explanation of the
observed resonance, taken together with the null results of new physics
searches in all the other channels, requires a scalar with rather exotic
behaviour. We then demonstrate that a fairly simple-minded extension of the
minimal Randall-Sundrum model can yield a radion candidate which might
reproduce this exotic behaviour.
