A doctor made it his regular habit to stop off at a bar for a hazelnutdaiquiri on his way home. The bartender knew the doctor's habit and wouldalways have a drink waiting. But one day the bartender ran out of hazelnutextract, so he substituted hickory nuts. When the doctor arrived, he took asip and exclaimed, "This isn't a hazelnut daiquiri!""No, I'm sorry," the bartender replied. "It's a hickory daiquiri, doc."