Place it at the very start of a scene as the attention cue, before the reveal or spoken line it is calling for. Follow it with a bell ding for a clean confirmation, or precede it with a door knocking sound when someone is being summoned inside.
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This clip is a 14-second stretch of clear human whistling, the German 'Pfeifen' in its title, with a sustained melodic tone rather than a short referee blast. It feels light, cheeky and attention-grabbing, the kind of sound that turns a plain moment into a playful call-out and makes listeners look up expecting something to happen next.