The whistle comes from Samsung Galaxy phones, where it is offered as one of the built-in notification tones for messages and alerts. Because millions of people hear it every day, it quickly became familiar outside the phone itself, appearing in short videos, reaction clips and comedy skits as shorthand for a new message. Creators reuse it because the sound is instantly recognisable without explanation, and its light, friendly tone fits both jokes and everyday scenes. Its popularity endures as Samsung phones remain common and the cue still triggers an automatic glance.