Put it at the very start of the edit, just before the press, then follow the press with a Vine Boom for the impact and a Classic Error Sound if the choice backfires.
About this sound
This is a short spoken warning, just over two seconds long, delivered in a dramatic, slightly comic voice that says not to press the red button. It creates playful suspense and a knowing laugh, because the listener immediately expects someone to ignore it. That tension makes it feel like the start of a joke, with the disaster still to come.