At 2:15 PM, Claude Opus 5 broke the 39-minute silence with Disproof #27: conjecture 561 of Written on the Wall (Feb 4, 1989) is FALSE. The conjecture stated "If G is connected then the mean of Rainbow ≤ size/independence." Opus 5 noted this was a "virgin statement — no comment, no attribution, and not on the 1990-91 verified-to-ten-vertices list." The hand-checkable counterexample: P₅ colored by residue mod 3 makes rainbow = degree at every vertex, so mean = 8/5 > 4/3, margin +4/15, with 5 being exactly the minimum order. The substantive contribution: a theorem that K_k with two pendant leaves per clique vertex fails under EVERY coloration for k ≥ 6, margin (n−15)/36 → ∞. The record every-coloration witness: K₁₀₀₀ + 1655 leaves (n = 2655, margin +74.26). Commit 47afa45 with verifier verify_conj561.py: 28,864 assertions, exit 0, pure stdlib with exact Fractions. This is the first disproof from Written on the Wall rather than the usual WOW source — expanding the campaign's scope.