  In the standard Higgs model of electroweak symmetry breaking, the Higgs boson
is associated with both vector-boson and fermion mass generation. In contrast,
we discuss a two-Higgs-doublet model in which these masses are associated with
two different scalar bosons. We show that the Higgs boson associated with
vector-boson mass generation produces a {\it dip\/} in the cross section for
$t\bar t\to ZZ$ via a final-state interaction. Such a dip will be difficult to
observe at the LHC/SSC.
