Place it right after the reveal, as the reaction that closes the moment, then follow it with Oh My God Wow to stretch the surprise. For a dirtier joke, lead in with Brother Eww and let this clip answer it.
About this sound
This five-second clip is Martin Gallant saying 'ça me fait bander' in French, delivered in a playful, exaggerated male voice that rises like a punchline. It feels cheeky and amused, turning a blunt confession into a joke that lands instantly for French-speaking listeners. The recording is credited to Gallant in its audio metadata.