This tale comes from the “Puns, Puns and More Puns” website. The author is not known.
Roger Winslow was very thin because he was so afraid to spend money for food. He looked forward to the day when his grandfather would die and leave him a fortune.
The grandfather died but all he left Roger was a cookie. They came to Roger looking for the fortune but couldn’t find it because it had disappeared into the thin heir.