Saved Not By A Doctor

A Kerry child swallowed a lOp piece. The mother began to scream and a passer-by rushed in. When he heard what happened he took the child by the heels, held him upside down, shook him for a while and the lop dropped out. The mother was delighted.
Thank you very much,' she said. 'By the way are you a doctor?'
'No ma'am,' he replied. I'm from the Revenue Commission.'