sub MY::c_o {
     my $self = shift( @_ );  # get our MM object
     local *c_o;              # localize to inside our current scope at runtime.
     my $inherited_text = $self->MM::c_o( @_ ); # any other args get passed to
                                                # the "stock" MM method (there
                                                # generally are none).
     $inherited_text =~ s/old text/new text/; # do vengeance on those who have
                                              # wronged us.
     return $inherited_text; # a return of a scalar whose value is just a
                             # (probably multi-line) string.
 }