Place it at the moment Perry leaves the scene on screen, then follow it with Metal Gear Alert for the mission reveal and Cartoon Chase Music when the pursuit begins.
About this sound
This short Perry the Platypus clip lasts just over two seconds and captures his quick, rattling chatter, the wordless noise he makes instead of speaking. It feels playful and sneaky, like a secret agent slipping away unnoticed, and it comes from Phineas and Ferb, where Perry leads a double life as a quiet pet and a covert agent.