My father's a Midnight Mechanic
He works in the middens by night
And when he comes home in the morning
He's covered with Turkish Delight.
My grandmother (a very proper old lady) used to recite a version when I was tiny, which went:
My father's a midnight mechanic
He works like a fiend in the pit
He goes out each evening and comes home each morning
All covered all over in... then she'd sing "sweet violets, sweeter than the daisies" etc.
She had an outside loo with the pipes heavily lagged and rough 'izal' paper hanging by string on a nail, you didn't hang around there on a frosty winter morning!