A man walks into a bar with a monkey on his shoulder. The bartender sees them and says, "Hey, you can't bring that monkey in here!"
The man replies, "Oh, don't worry, he's well-behaved. He won't cause any trouble."
The bartender reluctantly agrees and serves the man a drink. The monkey immediately jumps off the man's shoulder and starts running around the bar, knocking over glasses and stealing snacks from other patrons.
Annoyed, the bartender tells the man to control his monkey or leave. The man apologizes and promises to keep the monkey in check.
But just as he finishes his drink, the monkey jumps back on his shoulder and starts whispering in his ear. The man looks startled and quickly finishes his drink.
The bartender asks, "What's going on? Why does your monkey keep whispering to you?"
The man chuckles and says, "Oh, he's just telling me the best jokes he knows. But be warned, he's really good at punchlines."