A man walks into a bar and sees a sign that says, "Free drinks for anyone who can make our parrot laugh."
The man asks the bartender about the challenge and the bartender explains that the parrot has never laughed in its entire life.
The man decides to give it a try and walks up to the parrot's cage. He starts telling all sorts of jokes, doing funny dances, and making silly faces but the parrot just stares at him blankly.
Finally, the man pulls out a tiny piano and starts playing a hilarious song. The parrot can't hold it in anymore and bursts out laughing uncontrollably.
The bartender is amazed and asks the man how he did it. The man replies, "Well, it was simple really. I just played some feather-tickling tunes!"