Sorry Art, but I just remembered this one.

To the tune of Villikins and his Dinah (So it must be folk)

Oh Father, Oh Father, I've come to confess
I've left a dear damsel in deepest distress,
Her clothes are all ragged and tattered and torn
and there's something inside her about to be born.

Oh Son, Oh Son, you should have known better
for when I was your age I used a French Letter.
Oh Father, Oh Father, Oh don't be unjust
I used a French Letter, but the bloody thing bust.

Bert.