Place it immediately after the predictable statement in your edit, as the punchline to the setup, then follow it with Oh My God Wow for a bigger reaction and Nelson's Ha-Ha! to close the bit.
About this sound
This is a short, punchy spoken line delivered with emphatic, knowing energy, as if the speaker has already heard the excuse coming. The clipped delivery and rising emphasis make it feel smug, teasing and a little exasperated, perfect for calling out a predictable response before it lands. It works best as a quick reaction to someone stating the obvious.