The Hallowe'en Interaction (HWI) is a ghoulish way of investigating nuclear

structure.  Although it is dominated by the unsinister strong interaction, it

howls out in full force in the enchanted mirror of parity violating (PV)

observables.  The HWI is classified by the spin and isospin dependence of

transition amplitudes involving S and P waves.  There is an active program to

determine these mysterious parameters by measuring hadronic PV in reactions

with spine-chilling neutron beams.  These unnerving experiments use only

few-body observables, for which nuclear wave functions are not so horribly

gruesome to calculate.  We report startling intermediate results from the

NPDGamma experiment, sensitive to the long-range weak pion exchange, and

currently haunting the SNS.  The n-3He experiment is lurking in the shaddows

to pin down isospin zero couplings frightfully soon afterwards.  A

complementary experiment to measure the ghastly neutron spin rotation in 4He

is being scared up for an improved precision run at the NCNR reactor at NIST.

We show how this wizardry will over-constrain the four dominant couplings of

the HWI and will lay skeletons to rest for the first time.