  We discuss the elementary physics of the final state Coulomb interactions in
Hanbury-Brown Twiss interferometry, showing -- with explicit comparison to E877
data for $\pi^+\pi^-$ and $\pi^\pm p$ -- that the Coulomb corrections in the
pair correlation function can be well understood in terms of simple classical
physics. We connect the classical picture with descriptions in terms of Coulomb
wave functions, and investigate the influence of the ``central'' Coulomb
potential on the pair correlation function.
