A 75-year-old man, his hair is completely white, marries a 22-year-old girl and she gets pregnant. Nine months later, he is siting in the maternity ward, talking to the nurse.
“Hey! Well, how’d I do?”
The nurse says, “she had twins!”
“He-he! Just goes to show, even if there is snow on the roof, there is still fire in the furnace!”
The nurse says “Well you better change the filters, both the babies are black!”