Place it at the end of a scene where the fun gets cancelled, after a game show buzzer for the failed plan and before emotional damage for the rejected friend, then close with baby laughing to turn the scolding into a shared joke.
About this sound
The clip is a short voice line, just under four seconds, delivered in a teasing, sing-song voice that tells a party pooper they get no cake for spoiling the mood. It feels cheeky and lighthearted, more like a playful scolding than a real telling-off, and its simple wording makes the joke land straight away even for someone hearing it for the first time.