Place it as the final beat after the last line of dialogue, once the call scene is established with a Discord Call, and follow it with a reaction shot. For a bigger payoff, build tension first with a Dun Dun Dun before the call ends, so the hang-up becomes the joke's closing moment.
關於此聲音
This is a very short telephone hang-up effect, lasting just under a third of a second, with a single sharp click as the receiver goes down. It feels abrupt and final, like a conversation ending before the other person can reply, which makes it funny as a sudden dismissal and useful as a clean punctuation mark for a scene.