Put this clip at the opening of a prank or reveal edit, then follow it with a few moments later to jump ahead, and close with the fail sound if the plan goes wrong in the final shot.
About this sound
A short 2.2-second voice clip of the line 'I solemnly swear that I am up to no good' spoken to activate a magical map. It feels mischievous and conspiratorial, like the start of a secret plan about to be revealed. The line comes from Harry Potter, where it unlocks the Marauder's Map.