A doctor stopped at a bar on his way home and ordered a frozen daiquiri. After finishing it, he complimented the bartender on how good it was and went on his way.

He returned the next evening and again ordered a frozen daiquiri. He continued this routine each evening and soon became friends with the bartender. After a while the bartender started putting a walnut on the frozen daiquiri, which pleased the doctor greatly.

Fast forward several months later, and the doctor shows up at the bar and orders his usual. The bartender realizes he's out of walnuts, so he hastily substitutes a hickory nut, hoping the doctor won't notice the difference.

"What's this?" asks the doctor, looking at the drink he'd been served.

The bartender replies, >!"It's a hickory daiquiri, Doc!"!<