  The threshold pbar-p peak in BES data for J/\Psi to gamma-pbar-p may be
fitted as a cusp. It arises from the well known threshold peak in pbar-p
elastic scattering due to annihilation. Several similar examples are discussed.
The PS185 data for pbar-p to Lambdabar-Lambda require an almost identical cusp
at the Lambdabar-Lambda threshold. There is also a cusp at the Sigma-N
threshold in Kminus-d to piminus-Lambda-p. Similar cusps are likely to arise at
thresholds for all 2-body de-excitation processes, providing the interaction is
attractive; likely examples are Lambda-pbar, Sigma-pbar, and Kbar-Lambda. The
narrow peak observed by Belle at 3872 MeV in piplus-piminus-J/Psi may be a 1++
cusp due to the Dbar-D* threshold. The narrow Xi*(1862) observed by NA49 may be
due to a threshold cusp in Sigma(1385)-Kbar coupled to Xi-pi and Sigma-Kbar.
The relation of cusps to known resonances such as fo(980) is discussed.
