A stockbroker was cold calling about a penny stock and found Rodney a client.  "I think this one will really move said the broker, it's only $1 a share now." he told Rodney

"OK buy me 1000 shares," said Rodney.

The next day the stock was at $2. Rodney called the broker and said, "you were right, give me 5000 more shares".

The next day Rodney looked in the paper and the stock was at $4.  He ran to the phone and called the broker, "get me 10,000 more shares" "Great" said the broker.

The next day Rodney looked in the paper and the stock was at $9. Seeing what a great profit he had in just a few days, he phoned and told the broker, "Sell all my shares."

The broker said, "To whom? You were the only one buying that stock."