Place it at the peak of a reaction beat, just after the surprise lands and before the edit moves on. Follow it with JoJo To Be Continued for the classic freeze-frame ending, or open with Za Warudo Time Stop and let this clip answer the pause. For another JoJo sequence, add Giorno Giovanna Theme after the reaction settles.
About this sound
Joseph Joestar shouts “Oh my god” in a loud, theatrical English outburst lasting about three seconds, his voice rising fast from surprise into full-blown panic. It feels funny and frantic, like a cartoon reaction turned up too far, and it works because the alarm sounds completely sincere. The line comes from JoJo’s Bizarre Adventure, where his dramatic English exclamations became a signature part of his character.