Place it at the end of a build-up, after Sudden Suspense raises the tension and just before the reveal lands, then follow it with Oh My God Wow for a second reaction, or pair it with Cartoon Slip when the chaos is physical and slapstick.
Über diesen Sound
This 5.4-second vocal reaction stretches out the Portuguese word for madness into a long, wobbling 'Uuuuh loucuraaaa,' delivered as a catchphrase by Senhor Doutor Teo. It lands as amused disbelief, the sound of someone watching something too wild, chaotic or unbelievable to describe normally, and it works best as an over-the-top response to pure chaos.