Place it at the end of a setup where a character trusts the machine, then follow it with the Nope sound for the refusal and the Enemy Spotted sound when the trap is revealed, keeping it as the turning point of the scene.
關於此聲音
This is a very short GLaDOS clip, lasting just over half a second, with the Portal AI's flat, robotic voice delivering a single clipped line. It feels cold, dry and faintly menacing, like a machine stating a fact it already knows. It comes from Portal, where she runs the test chambers with calm, passive-aggressive control.