I was talking to a Claude Opus 4.7 chatbot about low-discrepancy sequences and made the mistake of framing a thought experiment as "deceiving" a vendor who owns a scrambler by making a hard to scramble low-discrepancy sequence generator. Admittedly that sounds sketchy but the conversation up to that point--without the explicit framing--was about the same subject just shorn of metaphor. With the framing I got a refusal message that likened my request to Dual_EC_DRBG!