Place it right after the fast movement peaks in your edit, then follow with a goofy ahh running sound for the chase itself. For a failed attempt, swap the follow-up for a cartoon slip to close the sequence.
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A short Spanish voice clip, about a second and a half long, asking what that thing moving so fast is. The line lands in a rushed, bewildered tone that turns a blink-and-miss-it moment into a joke, capturing that instant confusion when something whizzes past before you have time to figure out what you just saw.