Put it at the end of a short failed-whistle setup, after a brief confused reaction such as You What, then let Woody Woodpecker Laugh answer it so the sequence moves from attempt to admission to laughter.
關於此聲音
This short spoken line lasts just under seven seconds and delivers a plain admission from a character who cannot whistle, delivered in a flat, slightly embarrassed tone. It feels awkward and relatable, the kind of small failure that makes people laugh because they have felt it themselves. The clip comes from The Grim Adventures of Billy and Mandy.