An old man and his son had a one-horse farm where they barely made a
living. Then, one day, the son hit the lottery and won $50,000.
The young man rushed into town, collected his money, then hurried back
home. He ran across the field, told his father the news, and handed the
older man a $50 bill.
The father looked at the money for a moment and then said, "Son, you know
I've always been careful with what little money we had. I didn't spend it
on whiskey or women. In fact, I couldn't even afford the license to 
legally marry your Ma."
"Pa!" the young man stammered, "do you know what that makes me?"
"Yep," said the old man fingering the $50, "... and a cheap one, too.