What Do They Know. Bryan:. All they know. Is when we fight. They never see us in the loving times. What do they know. They don't know. A thing. Mark:. And they don't know. How laughter flies. Only the stories. Most of which are lies. What do they know. They don't know. A thing. Shane:. How can you understand. A love so strong. When you never shared that with someone. And when all the lies are dead and gone. We'll still be here. We'll prove them wrong. Mark:. Cause they don't feel. Your touch at night. The way your hair falls in the morning light. What do they know. They don't know. A thing. Bryan:. How can you understand. A love so strong. When you never shared that with someone. And when all the lies are dead and gone. We'll still be here. We'll prove them wrong. Shane:. Cause all they know is how to criticize. They'll never take a chance in their own lives. What do they know. They dont know. A thing. And all I know. Is they don't know a thing.