Place it as the first reaction beat after the unbelievable claim, before the explanation or punchline, then follow it with the You What SpongeBob clip for a second double-take and finish with the Law and Order Dun Dun sting when the truth lands.
关于此声音
This is a very short voice clip of Cartman firing off a single sharp 'what' in his high, bratty tone, lasting less than half a second. It lands with stunned, confrontational disbelief, as if he has just heard something ridiculous and refuses to let it pass, making it funny, awkward and instantly recognisable to anyone who knows the character.