My first frame is random but analyze: what should appear in frame one? Map the first-frame psychology: text, face, movement, contrast. Show me the first-frame engineering: this element in first frame = this scroll-stop rate. Calculate: if I optimized first frame for maximum pattern interrupt, what's the reach boost? Give me the first-frame formula: these elements stop scrolling, these don't register. Include: what makes frame one attention-grabbing, how to test first-frame effectiveness, and why your first frame might be invisible.