Since the Intern's mouths were stitched up so fine and precise, because their whistleing was very annoying to the Vykkers, I like to think maybe the Intern's whistle could be deadly in it's own strange way. Like if one Intern whistles, then it won't harm anyone but if many whistle at the same time, "like a hundred Interns," then the whistling sound would become deadly. So the Vykkers stitched their mouths so tightly shut, that they can't even talk, Just mumble. Perhaps at one time the Vykkers were being harmed do to the Intern's whistleing noise and they had to take drastic measures to fix the problem. So they invented to Stitch 2000.
Thats my theory.
