All your tests are green. Your users are seeing bugs. What went wrong? You followed the testing pyramid to the letter: unit, integration, end-to-end… and yet, a simple dependency update is all it takes for unexpected visual changes to slip through the cracks and land straight in your users' hands. Because some regressions are invisible to functional tests. They hide in pixels, not in logic. In this talk, I'll introduce you to screenshot testing: a deceptively simple approach that catches what your test suite can't — by comparing visual snapshots between versions to spot what changed. We'll also explore how MCPs and agentic AI are shaking things up, making these tests easier to write and maintain than ever before. Your green pipeline has been lying to you. Let's fix that.