A fellow with a bad cough comes in to the pharmacy, walks up to the counter and asks for the pharmacist. A young clerk tells him that the pharmacist is not available. The man asks the young clerk if he can recommend anything for his cough.
The clerk gives him a bottle of some medicine for his cough. The customer takes a big swig, then after a few minutes, with no apparent relief, he takes another, and another.
In a short while, the pharmacist returns, and sees his old friend, the customer with the cough, sitting quietly in a booth near the soda fountain. He says to his clerk that the fellow has never before stopped at the soda fountain.
The clerk proudly tells the pharmacist the story of his transaction. The pharmacist looks at the recommended medication and angrily reprimands the clerk for recommending a laxative, instead of cough syrup.
The clerk reminds the pharmacist the whatever the mode, the medication was effective. The pharmacist replies, "Now, he's afraid to cough!"