So hasn't anyone heard of the song my dad always followed up with after singing 'oh the black cat piddled in the white cats eye' ..perhaps the only link was in his own mind:-
    "please don't pull our lavatory down,
    wouldn't it be a shame,
    dad's away on the ocean blue,
    and the cat's in the family way
    so please don't pull our lavatory down,
    wouldn't it be a shame,
    'cos if you pull our lavatory down,
    we'll have to crap out in the rain!

Like I said maybe there is no link except in my memory...where it would be tenuouse at best .....regards ....Ken