Place it right at the reveal in a short edit, after the mistake is already visible on screen. Follow it with a fail sound meme button for the consequence, or lead in with a bruh meme sound button when the blame lands first.
Über diesen Sound
A very short voice clip of the line 'I didn't do that' lasting under a second, delivered as a flat denial. It feels funny and sheepish, like a kid caught mid-mischief trying to sound innocent. The line comes from Hotel Transylvania, the animated movie the sound is named for.