A man walks into a bar with a monkey on his shoulder. The bartender says, "Hey, we don't allow pets in here."
The man replies, "Oh, don't worry, he's not a pet. He's my business partner."
The bartender raises an eyebrow and asks, "Your business partner? What kind of business do you do with a monkey?"
The man smirks and says, "I'll show you." He puts the monkey on the bar and the monkey immediately starts flipping through the bartender's drink menu, pointing to various drinks with a flourish.
The bartender is amazed and asks, "How did you train him to do that?"
The man shrugs and says, "It's simple, really. I just taught him to always say 'no' when I ask if he wants another banana."
The bartender bursts into laughter and pours them both a round of drinks. The man and his monkey toast to their successful partnership and enjoy a night of revelry at the bar.