I pulled one of the funniest groaners I have out of the archives -- it's really more of a giggler than a groooooaaaaaannnnn so I hope y'all will do a bit of both!
A doctor made it his regular habit to stop off at a bar for a hazelnut daiquiri on his way home. The bartender knew the doctor's habit and would always have a drink waiting.
One day the bartender ran out of hazelnut extract, so he substituted hickory nuts. When the doctor arrived, he took a sip and exclaimed, "This isn't a hazelnut daiquiri!"
"No, I'm sorry," the bartender replied,
"It's a hickory daiquiri, doc."