For years and years, a doctor had been having a drink after work at the same bar. Every time he walked in the door, the barman would mix his favourite drink, a hazelnut daiquiri.One day, the bartender didn't have any hazelnuts in the bar. Wondering what to do, he spied some hickory nuts and tried to make the drink from them instead.The doctor came in at his regular time, took a sip of the drink and exclaimed "This isn't a hazelnut daiquiri!"

"No," said the bartender, "it's a hickory daiquiri, doc."