Put this clip last in a short edit, right after the setup shot resolves. Pair it with the baby laughing meme sound just before it to set up the mischief, then follow it with the emotional damage meme sound as the friends' exaggerated reaction to close the sequence.
About this sound
This is a short Brazilian Portuguese voice clip, under three seconds, of a calm voice delivering the line 'meu coração é pura maldade', credited to Lord Primata. The delivery feels dramatic and cheeky, turning a claim of pure evil into playful menace rather than a real threat, which makes the contrast itself funny.