A stockbroker was cold calling about a penny stock and found Paddy a client. "I think this one will really move said the broker, it's only $1 a share now." he told Paddy
"OK buy me 1000 shares," said Paddy.
The next day the stock was at $2. Paddy called the broker and said, "you were right, give me 5000 more shares". The next day Paddy 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 Paddy 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."