Particle collisions at energies well above the Planck scale are believed 
to be dominated by the production of black holes.  If the fundamental 
Planck scale is of order a TeV, as suggested in certain theories with 
large extra dimensions, microscopic black holes may be produced at the 
Large Hadron Collider at a rate of up to 1 Hz.  Black hole production 
and decay leads to very dramatic events with a cross section which 
grows with a power of the energy.  Standard hard scattering processes 
such as Drell-Yan or QCD jet production are also exponentially
suppressed.  Observation of these signatures would provide an
experimental confirmation of the infrared--ultraviolet nature of quantum
gravity, and herald the end of experimental investigation of short
distances by high energy scattering.