A duck walks into a bar. He walks up to the counter and asks the bartender, "You got any grapes?"
The bartender looks at the duck and says, "No, sorry. We don't got any grapes."
"Okay." The duck turns around and walks out. The next night, the duck comes back to the bar. "You got any grapes?"
The bartender looks at the duck and says, "No. We don't have any grapes."
"Alright." The duck turns around and walks out. The next night, the duck goes into the bar and asks the bartender, "You got any grapes?"
"No!" the bartender yells. "We don't have any grapes and if you come back in here again, I'm going to shoot you!"
"Okay." The duck turns around and leaves.
The next night, the duck enters the bar and asks the bartender, "You got any guns?"
"No," the bartender says.
"Oh." The ducks smiles. "Then can I have some grapes?"