Place it right after the unbelievable claim, as the first reaction in the edit, then follow it with Oh My God Wow for a bigger response. For a slower build, open with No No Wait Wait before the claim lands, then let this clip question it.
關於此聲音
This is a very short spoken clip, lasting just over a second, in which a voice calls out to Brandon and asks if he is serious. The delivery is flat and incredulous, with the emphasis landing on the question itself. It gives a quick hit of disbelief and dry amusement, perfect for calling out something absurd without saying a word yourself.