The best demo day presentation anyone remembers went like this: a student walked on stage, pulled out her phone, and said, "My grandmother has diabetes and can't read nutrition labels easily." She held the phone up to a cereal box. Her app instantly read the label, flagged the sugar content, and spoke aloud: "This cereal has 14 grams of sugar per serving. That's above your daily target. Would you like me to suggest an alternative?"

The audience was hooked in ten seconds. Not because the technology was groundbreaking, but because the problem was real, the demo was live, and you could feel why it mattered. She didn't start with "I built an app that uses GPT-4 and OCR to..." She started with her grandmother. That's what makes a great demo.