Place it just before the turning point in a scene, then follow it with It Was At This Moment He Knew for the realisation, and finish with Fail Sound Meme once the plan collapses. It also works ahead of a villain entrance, setting up a reaction clip before the consequences arrive.
About this sound
This three-second clip is a single spoken line in which the speaker says they have a very bad feeling about what comes next. It lands with a mix of dread and humour, the uneasy feeling of knowing something is about to go wrong before it happens. The line works as a quick warning, a nervous reaction, and a comic pause before the chaos that follows.