Place it near the end of a confusing scene, after the reveal, so it acts as the closing reaction. Pair it with a short huh for the first beat of disbelief, then follow it with an amazed wow to show the moment has sunk in.
About this sound
This eleven-second vocal clip centres on one slow, bewildered sentence that begins with a long, drawn-out mmm before the speaker admits they cannot follow what has just been said. The close, conversational delivery makes the confusion feel immediate and sincere, while the gentle word baby keeps it warm rather than mocking. It creates a funny, awkward pause that lets an absurd moment land before anything else happens.