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 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 because this one is black."