Because dogs can’t whistle.
Joke Explained
This joke is funny because it presents a logical but unexpected answer to a seemingly simple question. The setup creates an anticipation that the punchline will provide a scientific or technical explanation for why humans can’t hear a dog whistle. Dog whistles emit frequencies that are typically beyond the range of human hearing, and one might expect an answer related to sound frequencies or human auditory capabilities.
However, the punchline humorously subverts this expectation by offering a straightforward and humorous reason – that dogs can’t whistle. The humor comes from the reversal of roles implied by the punchline: instead of explaining the human inability to hear the whistle, the joke provides a reason based on the dog’s inability to produce a whistle.
The unexpected and absurd twist in the punchline, along with the clever reversal of logic, creates a lighthearted and amusing moment. This type of humor often plays with assumptions and conventions, leading to a delightful and unexpected punchline that makes the joke funny and enjoyable.