The line comes from Portal, Valve's 2007 puzzle game, where Aperture Science sentry turrets guard test chambers and speak in a sweet synthetic voice voiced by Ellen McLain. Turrets call out phrases like who's there when they detect the player, then open fire seconds later. Clips of those lines spread through gaming videos, machinima and soundboards in the late 2000s and stayed popular because the contrast between the innocent delivery and the lethal intent is instantly recognisable, even to viewers who never played Portal.
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The Portal turret saying who's there in its soft robotic voice, a short alert line used for jump scares, gaming edits and sneaky character entrances.
This is the Aperture Science turret from Portal calmly asking who's there the moment it senses movement nearby. The line is delivered in a high, childlike robotic voice that sounds polite and innocent, which makes the threat behind it funnier and creepier at the same time. It lasts just over a second, so it lands like a quick alert ping in a video. Viewers instantly recognise the mix of cute and dangerous, and the question creates a tiny pause of suspense before whatever appears on screen next.
