Rejuvenating pills

What of Jim Farrell who found riches in America and sent home a newly discovered rejuvenating drug, guaranteed to take years off a person's age?

Try a course of these, mother,' he wrote. Till be home in six months - I can't wait to see the change in you.'

Six months came and went and Jim arrived at Dublin. Through the waiting throng at the airport came a stunning blonde girl pushing a pram. 'Jim, don't you recognise me? I'm your mother. I took one of the pills and look at me!'

'In the name of heaven,' said Jim, 'what's that in the pram?'

'Ach, that's your father, he took two pills!'