  We discuss a concept of off-centred cavity supernova explosion as applied to
neutron star/supernova remnant associations and show how this concept could be
used to preclude the anti-humane decapitating the Duck (G5.4-1.2 + G5.27-0.9)
and dismembering the Swan (Cygnus Loop), as well as to search for a stellar
remnant associated with the supernova remnant RCW86.
