Hallucinated Quote Traced to System Prompt Example, Not Training Data

A deterministic hallucination in an omni-modal model — always producing 'Yeah, Friday at five' on silent video — was caused by two bugs: a worked example in the system prompt injected by a prompt optimizer, plus a separate model tendency to confabulate audio content over silence. Ablation confirmed both the lexical anchoring from the prompt example and an independent audio-hallucination behavior.