Joke stolen from: The Daily Dose

Lanahan's hair kept falling out and he complained to his barber. "That stuff you gave me," he cried, "is terrible. You said two bottles of it would make me hair grow, but nothing's happened."

"I don't understand it," said the barber. "That's the best hair restorer made."

"Well," said Lanahan "I don't mind drinking another bottle, but it better work."