Place it at the exact cut where the secret is about to be shown, as the last beat before the visual payoff. Follow it immediately with a chipmunk laugh for a sillier finish, or keep it solo when the reveal itself should carry the rest of the scene.
About this sound
This 2.5-second clip is a high, squeaky exclamation of 'I'm so excited' in the Cat in the Hat's playful voice. It feels gleeful and a little chaotic, like pure delight spilling out before anyone can contain it. The character was created by Dr. Seuss and first appeared in his 1957 children's book The Cat in the Hat.