Place it just before the reveal in a short edit, then follow it with the Classic Error Sound for the mistake itself and the Dun Dun Dun sting for the pause that follows. That order keeps the warning, the error and the reaction separate instead of stacking them at once.
À propos de ce son
This is the short, bright alert chime from Windows XP, lasting just over a second. It sounds instantly familiar and slightly urgent, like a computer asking for attention without sounding serious. It brings a quick flash of early-2000s nostalgia, and it works because listeners recognise that old system tone at once.