Film making techniques: dubbing experiment

This film making technique, which features a video clip, is an experiment in dubbing, or replacing one sound with another, and the sound of a human voice has been dubbed or replaced with the sound of a duck.

It’s obvious from the person’s  facial expressions and gestures that she is criticising someone, but because her voice has been dubbed with the sound of a duck, the person she is criticising can only hear a duck sound.
The scene is an experimental scene from my next short film which is called ‘Duckman.’
The scene might seem pretty bizarre, but actually it’s based on fact – it’s based on a real life situation. That situation is, when someone is criticising us we often stop listening to them and think of something else.
I’ve taken this real life situation a little further. Here, the person who is being criticised doesn’t just stop listening and think of something else – he hears duck sounds.
Is this an effective film making technique?
Should I replace the duck sounds with her voice, so that we can find out what she is saying?
Or is there another way of finding out what she is saying?
I have an idea how I can do this without replacing the duck sound with her voice.
(to be continued)