Place this clip at the top of a reaction edit as the alert that starts the bit, then follow it with the Mission Failed sound when the plan collapses, or swap that second hit for a correct ding when the plan actually works.
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This clip is a loud signal tone lasting just over a second, a sharp electronic blast marked as the original 999 version. It feels urgent and startling, the kind of abrupt hit that jolts a quiet moment and turns a simple alert into a joke through sheer volume and suddenness.