Place it immediately after the questionable action is shown, then follow it with Oh My God Wow as the next beat, or lead into it with No No Wait Wait when the warning comes first.
Über diesen Sound
This is a short Spanish voice clip, just under three seconds long, in which a speaker blurts out 'hostia, ¿qué haces?' as if catching someone mid-mischief. It feels startled, blunt and a little scolding, the kind of outburst that lands as disbelief rather than anger.