There was a 80 year-old man that married a 21 year-old woman. A year later the woman had a baby and the doctor came out and told the old man that he was the father of a 9lb 8oz baby boy. The old man replied, "This old motor is still a' running."
Next next year his wife had another baby and the doctor came out and told the man that he was the father of a 8lb 5oz baby girl. The old man replied, "This old motor is still a' running."
The next year his wife was back in the hospital yet again, having their third child and the doctor came out and told the old man that he was the father of a 10lb 9oz baby boy. The old man replied again, "This old motor is still a' running.''
And the doctor said, "Yeah but you better get your oil changed beacuse this one is black."