A doctor always heads to a restaurant after working, which is usually around 5PM. He always orders a hazelnut daiquiri before heading home. The waiters and waitresses always prepare the drink ahead of time because they always know the doctor will show up. One night a waiter noticed that there were no more hazelnuts left. Instead, he whipped up a hickory drink instead of a hazelnut one. The doctor soon arrived, sat down and took a sip from the glass. “What is this?!” He inquired. What did the waiter reply?