  Models with scalar doublets and charged scalar singlets have the interesting
property that they have couplings between one $Z$ boson and two charged scalars
of different masses. This property is often ignored in phenomenological
analysis, as it is absent from models with only extra scalar doublets. We
explore this issue in detail, considering $h \rightarrow Z \gamma$, $B \to X_s
\gamma$, and the decay of a heavy charged scalar into a lighter one and a $Z$
boson. We propose that the latter be actively searched for at the LHC, using
the scalar sector of the Zee model as a prototype and proposing benchmark
points which obey all current experimental data and could be within reach of
the LHC.
