  We analyze reactions of several types that are naively below threshold but
can proceed because of the release of binding energy from nuclear fission and
occasionally the formation of Coulombic bound states. These reactions include
(i) photofission with pion production and (ii) charged current neutrino-nucleus
reactions that lead to fission and/or formation of a Coulomb bound state of a
$\mu^-$ with the nucleus of a fission fragment. We comment on the possible
experimental observation of these reactions.
