Place it as the punchline after a short scene of someone searching cupboards, then follow it with Woody Woodpecker Laugh when the culprit is caught. For a confused reply before the accusation, open with You What and let this clip answer the question.
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This short, roughly five-second clip plays a loud, distorted Dutch voice asking where the chocolate is and saying everything is gone. The harsh, earrape-style blast makes the simple question feel frantic, accusatory and deliberately over the top. It comes from Samson en Gert, the Belgian children's television series, where the line is delivered as a comic complaint about missing chocolate.