Tearing Watercolor Paper

I wanted to cut up my playful, painted and printed watercolor paper to make a small folded book. I'd never cut watercolor paper before, so naturally I readied a blade -- my Exacto knife, with ruler and cutting board. Just in time I realized that I did not want a crisp edge. Tearing would be better. So I wandered the Internet and discovered this YouTube on tearing watercolor paper. It's a peaceful occupation.